observar
observar em 30 segundos
- To watch carefully to learn.
- To notice or point out a fact.
- To obey a rule or law.
- To examine scientifically.
- Visual Observation
- Using your eyes to carefully examine physical details of an object or person.
El científico pasa horas al día para observar el comportamiento de las hormigas en su hábitat natural.
- Intellectual Observation
- Noticing a trend, pointing out a flaw in an argument, or making a verbal remark.
Es obligatorio observar las normas de seguridad en la zona de construcción.
Me gusta sentarme en el parque y observar a la gente pasar durante la tarde.
- Rule Compliance
- Adhering to laws, regulations, traditions, or religious practices strictly.
El profesor pidió a los alumnos observar el experimento con mucha atención.
Podemos observar un aumento en las ventas este trimestre.
- Direct Objects
- The entity that is being watched or analyzed, which directly follows the verb without a preposition unless it is a person.
El detective decidió observar al sospechoso desde la distancia.
Los astrónomos usan telescopios para observar los planetas lejanos.
- Regular Conjugation
- Because it is completely regular, learning its pattern helps you conjugate hundreds of other -ar verbs.
Ayer observé un fenómeno meteorológico muy extraño en el cielo.
El médico observó que el paciente tenía fiebre alta.
- Subordinate Clauses
- Using 'que' after the verb allows you to describe complex situations that you have noticed or analyzed.
En esta región, se pueden observar aves migratorias cada invierno.
- Classroom Settings
- Educators use it to direct students' analytical attention to a specific subject or experiment.
Los estudiantes deben observar el mapa para encontrar la capital.
El biólogo viajó a la selva para observar a los monos en su entorno.
- Legal Documents
- Contracts and laws use it to mandate compliance with established rules and protocols.
Todos los ciudadanos tienen el deber de observar las leyes del país.
Me encanta sentarme en el balcón y observar el atardecer.
- Media and News
- Reporters use it to describe surveillance, monitoring of situations, or noting statistical trends.
Los economistas continúan para observar la inflación con gran preocupación.
- Overusing Observar
- Using it for casual activities like watching TV, where 'ver' or 'mirar' is much more natural.
Es un error decir que vas a observar una película en el cine; debes decir 'ver'.
El guardia de seguridad tiene que observar a los clientes en la tienda.
- Ignoring Formal Meanings
- Failing to recognize that 'observar la ley' means to obey the law, not just to look at it.
Es vital observar el límite de velocidad en esta carretera.
El actor pasó horas para observarse en las grabaciones para mejorar su técnica.
- Pronunciation Errors
- Pronouncing the 'v' with an English phonetic sound rather than the softer Spanish bilabial sound.
Al hablar, intenta que la 'v' de observar suene casi como una 'b' suave.
- Ver vs. Observar
- Ver is passive and effortless; observar is active and requires conscious cognitive focus.
Puedes mirar un cuadro, pero un crítico de arte va a observar cada detalle.
Nos sentamos en silencio para contemplar, no solo observar, la inmensidad del océano.
- Notar vs. Observar
- Notar is instantaneous recognition of a fact; observar is a continuous process of examination.
Al observar su rostro, pude notar que estaba mintiendo.
El inspector decidió escrutar los documentos en lugar de simplemente observar la portada.
- Fijarse en
- A highly common, conversational way to say 'pay attention to' or 'notice', replacing the formal 'observar'.
En vez de observar todo el coche, fíjate en la rueda delantera.
How Formal Is It?
Curiosidade
The root 'servare' in observar is the same root found in words like 'conserve', 'preserve', and 'reserve'. This explains why observar also means 'to obey or keep a rule'—you are 'preserving' the law.
Guia de pronúncia
- Pronouncing the 'v' like an English 'v' (biting the lower lip). It should be a soft 'b'.
- Stressing the second syllable (ob-SER-var) instead of the last.
- Pronouncing the 'r' at the end too harshly like an English 'r'. It should be a quick tap.
- Failing to pronounce the 'b' in the first syllable clearly, making it sound like 'oservar'.
- Adding an extra vowel sound before the 's', like 'obeservar'.
Nível de dificuldade
Easily recognizable due to its similarity to the English word 'observe'.
Requires remembering the personal 'a' when observing people.
Pronunciation of the 'v' and correct conjugation can be tricky for beginners.
Usually spoken clearly in formal contexts.
O que aprender depois
Pré-requisitos
Aprenda a seguir
Avançado
Gramática essencial
The Personal 'a'
Observo al profesor. (I observe the teacher.)
Direct Object Pronouns
El pájaro es bonito. Lo observo. (The bird is pretty. I observe it.)
Subordinate Clauses with 'que'
Observé que la puerta estaba rota. (I observed that the door was broken.)
Passive Voice with 'se'
Se observan muchos cambios. (Many changes are observed.)
Infinitive as a Noun
Observar la ley es importante. (Observing the law is important.)
Exemplos por nível
Yo observo el pájaro en el árbol.
I observe the bird in the tree.
Present tense, regular -ar conjugation for 'yo'.
Tú observas las estrellas por la noche.
You observe the stars at night.
Present tense, regular -ar conjugation for 'tú'.
El niño observa la televisión.
The boy observes the television.
Third person singular present tense.
Nosotros observamos la clase de español.
We observe the Spanish class.
First person plural present tense.
Ellos observan los animales en el zoológico.
They observe the animals in the zoo.
Third person plural present tense.
La profesora observa a los estudiantes.
The teacher observes the students.
Use of the personal 'a' before 'los estudiantes'.
Yo quiero observar la luna.
I want to observe the moon.
Infinitive form used after the conjugated verb 'quiero'.
Él observa el coche rojo.
He observes the red car.
Simple subject-verb-object structure.
Ayer observé un gato en mi jardín.
Yesterday I observed a cat in my garden.
Preterite tense for a completed past action.
Tú observaste el partido de fútbol.
You observed the soccer game.
Preterite tense, second person singular.
Ella observaba la lluvia caer.
She was observing the rain fall.
Imperfect tense for an ongoing past action.
Nosotros observamos que la puerta estaba abierta.
We observed that the door was open.
Using 'que' to introduce a subordinate clause.
Los científicos observaron el experimento.
The scientists observed the experiment.
Preterite tense, third person plural.
¿Observaste a ese hombre extraño?
Did you observe that strange man?
Question format with the personal 'a'.
Yo la observo todos los días.
I observe her every day.
Use of the direct object pronoun 'la'.
Ellos observaban el paisaje durante el viaje.
They were observing the landscape during the trip.
Imperfect tense describing background action.
Espero que observes los detalles del contrato.
I hope you observe the details of the contract.
Present subjunctive used after 'espero que'.
Mañana observaremos el eclipse solar.
Tomorrow we will observe the solar eclipse.
Future tense.
Si tuviera tiempo, observaría más la naturaleza.
If I had time, I would observe nature more.
Conditional tense in a hypothetical sentence.
He observado un cambio en su comportamiento.
I have observed a change in his behavior.
Present perfect tense (he observado).
Es importante observar las normas de seguridad.
It is important to observe safety rules.
Infinitive used as the subject of an impersonal expression.
Me pidió que observara la situación.
He asked me to observe the situation.
Imperfect subjunctive after a past tense request.
Estábamos observando a los pájaros cuando empezó a llover.
We were observing the birds when it started to rain.
Past progressive tense interrupted by the preterite.
No creo que él observe las reglas.
I don't think he observes the rules.
Present subjunctive used after a negative statement of belief.
Se observan mejoras significativas en la economía.
Significant improvements are observed in the economy.
Passive reflexive (se pasiva) construction.
El paciente debe ser observado durante 24 horas.
The patient must be observed for 24 hours.
Passive voice with 'ser' + participle.
Habiendo observado el problema, propuso una solución.
Having observed the problem, he proposed a solution.
Perfect gerund (habiendo observado) to show sequence.
Me gustaría observar que esta cifra es incorrecta.
I would like to observe that this figure is incorrect.
Formal use meaning 'to point out' or 'to note'.
Observar la ley es deber de todo ciudadano.
Observing the law is the duty of every citizen.
Infinitive used as a noun phrase, meaning 'to comply with'.
El fenómeno fue observado por múltiples testigos.
The phenomenon was observed by multiple witnesses.
Passive voice in the preterite tense.
A menos que observes las instrucciones, fallarás.
Unless you observe the instructions, you will fail.
Subjunctive used after the conjunction 'a menos que'.
Llevo horas observando el comportamiento de las células.
I have been observing the behavior of the cells for hours.
Periphrasis 'llevar' + gerund to express duration.
Es imperativo que la empresa observe los protocolos medioambientales.
It is imperative that the company observes environmental protocols.
Formal subjunctive usage for mandates and compliance.
El crítico observó sutiles matices en la interpretación del actor.
The critic observed subtle nuances in the actor's performance.
Advanced vocabulary collocations (sutiles matices).
De haber observado las advertencias, la tragedia se habría evitado.
Had the warnings been observed, the tragedy would have been avoided.
Conditional perfect and 'de' + infinitive for hypothetical past.
La comunidad observa rigurosamente el ayuno durante este mes.
The community rigorously observes the fast during this month.
Meaning 'to respect a religious practice' with an adverb of manner.
Cabe observar que los resultados difieren de estudios previos.
It is worth observing that the results differ from previous studies.
Formal academic phrase 'cabe observar' (it is worth noting).
Se le observó merodeando por las instalaciones a altas horas.
He was observed loitering around the facilities at late hours.
Impersonal 'se' with an indirect object pronoun.
El tratado obliga a las partes a observar una estricta neutralidad.
The treaty obliges the parties to observe strict neutrality.
Legal/diplomatic register of the verb.
Observando detenidamente el lienzo, descubrió la firma oculta.
Observing the canvas closely, he discovered the hidden signature.
Gerund used as an adverbial clause of manner.
El autor observa la decadencia de la sociedad con una ironía mordaz.
The author observes the decay of society with biting irony.
Literary usage implying philosophical or critical commentary.
Poco se observa ya aquella cortesía de antaño.
Little is observed anymore of that courtesy of yesteryear.
Inverted syntax for stylistic emphasis and poetic tone.
La observancia de la ley es el pilar sobre el que descansa la república.
The observance of the law is the pillar upon which the republic rests.
Use of the derived noun 'observancia' in a high-register philosophical statement.
Se limitó a observar, inescrutable, el desarrollo de los acontecimientos.
He limited himself to observing, inscrutable, the unfolding of events.
Complex syntax with an interpolated adjective.
Cualquier anomalía que fuere observada deberá ser reportada de inmediato.
Any anomaly that might be observed must be reported immediately.
Use of the rare future subjunctive (fuere observada) in a legalistic context.
Su capacidad para observar las flaquezas humanas era casi sobrenatural.
His capacity to observe human frailties was almost supernatural.
Abstract usage connecting observation to psychological insight.
Observóse un silencio sepulcral en la sala tras el veredicto.
A deathly silence was observed in the room after the verdict.
Archaic/literary enclitic pronoun placement (observóse).
Lejos de intervenir, optó por observar el inexorable curso del destino.
Far from intervening, he opted to observe the inexorable course of destiny.
Highly poetic and fatalistic context.
Colocações comuns
Frases Comuns
— To make a comment or point something out. Used in meetings or discussions.
Me gustaría hacer una observación sobre este tema.
— To be kept under medical watch. Used in hospitals.
El herido está en observación en urgencias.
— To follow the traditional practices of mourning after a death.
La familia observará el luto durante un año.
— To rest as prescribed by a doctor.
El médico le dijo que debe observar reposo absoluto.
— Without the need for instruments; easily observable. Related to the act of observing.
El planeta es observable a simple vista.
— To follow proper social rules and manners.
En esa cena es importante observar la etiqueta.
— To notice a pattern developing over time.
Hemos observado una tendencia al alza en las ventas.
— It is worth noting. A formal way to introduce a point.
Es de observar que la población ha envejecido.
— To abstain from eating for religious or medical reasons.
Muchos fieles observan el ayuno en esta época.
Frequentemente confundido com
Ver is passive seeing. Observar is active, analytical watching.
Mirar is directing your eyes at something. Observar implies scrutiny and gathering information.
Conservar means to preserve or keep. They share a Latin root but have different meanings.
Expressões idiomáticas
— To observe or examine something with extreme detail and scrutiny.
El auditor está mirando las cuentas con lupa.
informal— To observe so closely that nothing is missed.
Estaba tan fascinado que no perdía detalle de la obra.
neutral— To keep someone or something under strict observation or scrutiny.
El jefe tiene bajo la lupa al nuevo empleado.
informal— To stare fixedly at someone or something, a very intense form of observing.
Me clavó la mirada y supe que estaba enojado.
neutral— To look at someone with intense desire or to look at food with great hunger.
El niño se comía con los ojos el pastel de chocolate.
informal— To not take one's eyes off something; to observe continuously.
No le quites ojo a la maleta en la estación.
informal— To be very obvious or easily observable without effort.
Salta a la vista que están enamorados.
neutral— To observe someone out of the corner of one's eye, often secretly.
Lo estaba mirando de reojo durante toda la reunión.
neutral— To pretend not to observe something; to turn a blind eye.
El guardia hizo la vista gorda y lo dejó pasar.
informal— To observe a difficult situation safely from the outside without getting involved.
Es muy fácil criticar cuando ves los toros desde la barrera.
idiomaticFácil de confundir
Both relate to sight.
Ver is effortless perception. Observar requires focus and intent.
Veo el coche, pero observo al conductor.
Both mean directing attention visually.
Mirar is just looking. Observar is looking to learn or analyze.
Mira el cuadro, pero observa los detalles.
Both can translate to 'notice'.
Notar is a sudden realization. Observar is a continuous process.
Noté que estaba pálido al observarlo.
Both involve watching closely.
Vigilar implies guarding or watching for danger. Observar is more neutral or scientific.
El guardia vigila la puerta; el científico observa la célula.
Both can mean to follow rules.
Obedecer is general obedience. Observar is formal compliance, often with traditions or laws.
El perro obedece; el ciudadano observa la ley.
Padrões de frases
[Subject] + observar + [Direct Object]
Yo observo la luna.
[Subject] + observar + a + [Person]
El policía observa al sospechoso.
[Subject] + observar + que + [Clause]
Observé que estabas triste.
Se + observar + [Plural Noun]
Se observan mejoras en el sistema.
[Subject] + ser + observado + por + [Agent]
El cometa fue observado por los astrónomos.
Cabe observar que + [Clause]
Cabe observar que los datos son falsos.
[Subject] + observar + [Abstract Noun/Rule]
La empresa observa estrictas normas éticas.
[Gerund] + [Adverb], + [Clause]
Observando detenidamente, descubrió la verdad.
Família de palavras
Substantivos
Verbos
Adjetivos
Relacionado
Como usar
Very common in written Spanish, news, and professional contexts. Common in spoken Spanish but often replaced by simpler verbs in casual chat.
-
Voy a observar la televisión.
→
Voy a ver la televisión.
Observar is too analytical for watching TV. Use ver for entertainment.
-
Yo observo el hombre.
→
Yo observo al hombre.
Because 'el hombre' is a person and the direct object, it requires the personal 'a'.
-
Me observo el pájaro.
→
Observo el pájaro.
Do not use reflexive pronouns unless the subject is literally watching themselves.
-
Observé a la ley.
→
Observé la ley.
The law is not a person, so it does not take the personal 'a', even when the meaning is 'to obey'.
-
Espero que tu observas las reglas.
→
Espero que tú observes las reglas.
Expressions of hope like 'espero que' require the subjunctive mood (observes), not the indicative (observas).
Dicas
Don't forget the 'a'
Always ask yourself 'who am I observing?' If the answer is a person, put an 'a' before them. Observo a María.
Movies and TV
Never use observar for entertainment screens. Stick to 'ver la tele' or 'ver una película'.
Soft V
Relax your lips when saying the 'v' in observar. It should sound like a very soft, breathy 'b'.
Think like a scientist
If you are doing something that requires a clipboard, a microscope, or deep thought, observar is the right verb.
Under the magnifying glass
To sound native, use the phrase 'mirar con lupa' when you are observing something extremely closely.
Academic upgrade
Replace 'ver' with 'observar' in your Spanish essays to instantly elevate the formality of your writing.
Observar que...
Use 'observar que' followed by a clause to express a realization. 'Observé que estaba lloviendo'.
Following the rules
Remember that observing a law means obeying it, not just looking at a law book.
Fijarse as an alternative
In casual chats with friends, use 'fijarse en' instead of observar to sound more relaxed and fluent.
No double consonants
Unlike English 'observation', Spanish 'observación' has only one 'b' and one 's' sound. Don't add extra letters.
Memorize
Mnemônico
Imagine an OBSessive SERVant (ob-serv-ar) carefully watching over his master's house to make sure everything is perfect.
Associação visual
Picture a giant pair of binoculars with the word 'OBSERVAR' written across the lenses, focusing sharply on a tiny, detailed object.
Word Web
Desafio
Next time you are in a public place, spend 5 minutes actively 'observing' instead of just 'looking'. Write down three sentences in Spanish starting with 'Yo observo...' describing what you see.
Origem da palavra
The word observar comes from the Latin verb 'observare'. This Latin word is composed of the prefix 'ob-' meaning 'over' or 'towards', and 'servare' meaning 'to watch', 'to keep safe', or 'to guard'. Therefore, the literal historical meaning is to watch over something to keep it safe or to adhere to it.
Significado original: To watch over, guard, or keep safe.
Indo-European > Italic > Romance > Ibero-Romance > Spanish.Contexto cultural
There are no major cultural sensitivities or offensive connotations associated with this word. It is safe to use in all contexts.
English speakers often default to 'watch' for everything. Remember that in Spanish, you don't 'observar' a movie; you 'ver' it. Save observar for science, scrutiny, or rules.
Pratique na vida real
Contextos reais
Science and Nature
- observar el experimento
- observar las células
- observar la fauna
- observar el clima
Law and Rules
- observar la ley
- observar las normas
- observar el límite
- observar el contrato
Medical
- observar al paciente
- sala de observación
- observar los síntomas
- mantener en observación
Academic
- cabe observar que
- observar los datos
- observar una tendencia
- observar el gráfico
Daily Life
- observar a la gente
- observar el paisaje
- observar un detalle
- observar en silencio
Iniciadores de conversa
"¿Te gusta sentarte en un café y simplemente observar a la gente pasar?"
"¿Alguna vez has usado un telescopio para observar los planetas o las estrellas?"
"En tu trabajo, ¿qué detalles tienes que observar con más atención?"
"¿Crees que eres una persona observadora o sueles estar distraído?"
"¿Qué fenómeno natural te gustaría observar en persona, como una aurora boreal?"
Temas para diário
Escribe sobre un momento en el que observaste algo hermoso en la naturaleza.
Describe a una persona que conozcas bien. ¿Qué detalles observas en su comportamiento?
Reflexiona sobre una regla en tu sociedad que crees que todos deberían observar.
Imagina que eres un detective. ¿Qué observarías en la escena de un crimen?
Escribe sobre la diferencia entre mirar una obra de arte y observarla.
Perguntas frequentes
10 perguntasNo, it sounds very unnatural. Native speakers use 'ver una película' or 'mirar una película'. Using observar implies you are scientifically analyzing the film frame by frame.
You only need it when the direct object is a specific person or a beloved pet. For example, 'Observo el árbol' (no 'a') vs. 'Observo a mi hermano' (needs 'a').
The most common noun form is 'la observación', which means the observation. Another related noun is 'el observatorio' (the observatory).
Yes, it is a completely regular -ar verb in all tenses and moods. This makes it very easy to conjugate once you know the standard rules.
Yes, in formal contexts, 'observar' can mean to point out or to remark. For example, 'El abogado observó que el testigo mentía' (The lawyer observed/pointed out that the witness was lying).
The phrase is 'mantener en observación'. It is very commonly used in medical contexts, like in a hospital.
Vigilar has a connotation of security, guarding, or looking out for danger (like a security guard). Observar is more about gathering information or analyzing (like a scientist).
Yes, 'observarse' means to observe oneself. For example, 'Se observó en el espejo' (He observed himself in the mirror). It can also be used in the passive voice: 'Se observan cambios' (Changes are observed).
Yes, the meaning and usage are identical across all Spanish-speaking regions. The only difference is the pronunciation of the 'v' and 'c/z' in related words depending on the regional accent.
Use the imperative form. Informally: 'Observa esto' (Observe this). Formally: 'Observe esto'. Plural: 'Observen esto'.
Teste-se 200 perguntas
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Well written! Good try! Check the sample answer below.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
Read this aloud:
Você disse:
Speech recognition is not supported in your browser. Try Chrome or Edge.
/ 200 correct
Perfect score!
Summary
Observar is an active, deliberate verb. Unlike 'ver' (to see), it requires focus and intention, such as a scientist observing an experiment or a driver observing traffic laws.
- To watch carefully to learn.
- To notice or point out a fact.
- To obey a rule or law.
- To examine scientifically.
Don't forget the 'a'
Always ask yourself 'who am I observing?' If the answer is a person, put an 'a' before them. Observo a María.
Movies and TV
Never use observar for entertainment screens. Stick to 'ver la tele' or 'ver una película'.
Soft V
Relax your lips when saying the 'v' in observar. It should sound like a very soft, breathy 'b'.
Think like a scientist
If you are doing something that requires a clipboard, a microscope, or deep thought, observar is the right verb.
Conteúdo relacionado
Esta palavra em outros idiomas
Gramática relacionada
Mais palavras de general
a causa de
A2Significa 'por causa de' ou 'devido a'. É usada para dar uma razão seguida de um substantivo.
a condición de que
B2On condition that, provided that, or given that.
a dónde
A1Para onde? (indicando destino ou movimento)
a lo mejor
A2Talvez; possivelmente. 'A lo mejor' é uma expressão muito comum no espanhol falado.
a menos que
B1A menos que. Não irei a menos que ele venha. (I won't go unless he comes.)
a no ser que
B2Significa 'a menos que' ou 'a não ser que'. Introduz uma condição de exceção.
a pesar de
B1Apesar de; malgrado. 'Ele veio apesar da chuva.' (He came despite the rain.)
a_pesar_de
B2Apesar da chuva, saímos.
a propósito
B21. A propósito / Por falar nisso: usado para mudar de assunto. 2. De propósito: feito com intenção. 'A propósito, você viu meu livro?' e 'Ele fez isso de propósito.'
a raíz de
B2A partir de; em consequência de.