Adjetivo + Infinitivo (Es fácil aprender)
natural, describe acciones con sentimientos y opiniones usando adjective + to-infinitive.
Grammar Rule in 30 Seconds
Use 'to' + verb after adjectives to describe an action, express feelings, or give opinions about a task.
- Use 'to' after adjectives of difficulty like 'easy' or 'hard' (It's easy to learn).
- Use 'to' after adjectives of emotion like 'happy' or 'sad' (I'm happy to help).
- Add 'not' before 'to' for negative sentences (It's important not to forget).
Overview
to-infinitive. Es una de esas herramientas súper versátiles que te hacen sonar menos como un libro de texto y más como una persona real. Ya sea que te quejes de un juego con lag o le digas a un amigo que te alegra ver que su TikTok se hizo viral, este patrón es tu mejor amigo.to + verb). Lo usamos para describir qué tan fácil o difícil es algo, cómo nos sentimos acerca de una acción o para juzgar el comportamiento de alguien.How This Grammar Works
I am happy to meet you. Simple, ¿verdad? El adjetivo establece el estado de ánimo y el infinitivo nos dice de qué se trata ese estado de ánimo.
Formation Pattern
It is para declaraciones generales o I am / You are para personas.
to más la forma base del verbo.
When To Use It
This game is fun to play. Úsalo cuando seas cortés: I’m sorry to bother you.
Common Mistakes
-ing porque se siente natural en otros idiomas. Correcto: It is easy to learn English, NO 'It is easy learning English'.Contrast With Similar Patterns
interested, siempre llevan in + -ing.Quick FAQ
P: ¿Puedo usar esto con cualquier adjetivo?
R: ¡Principalmente sí! Especialmente aquellos que describen sentimientos, dificultad u opiniones.
Common Adjective + To-Infinitive Patterns
| Subject | Verb 'Be' | Adjective | Infinitive (to + verb) | Example |
|---|---|---|---|---|
|
It
|
is
|
easy
|
to learn
|
It is easy to learn.
|
|
I
|
am
|
happy
|
to help
|
I am happy to help.
|
|
They
|
were
|
surprised
|
to see
|
They were surprised to see us.
|
|
It
|
is
|
important
|
not to go
|
It is important not to go.
|
|
She
|
is
|
ready
|
to start
|
She is ready to start.
|
|
It
|
was
|
kind
|
to say
|
It was kind to say that.
|
Contractions in this Structure
| Full Form | Contraction | Usage |
|---|---|---|
|
It is easy
|
It's easy
|
Very common in speech
|
|
I am happy
|
I'm happy
|
Standard informal/neutral
|
|
It was not easy
|
It wasn't easy
|
Common in past tense
|
Meanings
This structure is used to provide more information about an adjective by following it with an infinitive verb. It often describes the difficulty, emotion, or necessity associated with an action.
Difficulty and Ease
Describing how hard or easy an action is to perform.
“It's hard to breathe in this heat.”
“The instructions were simple to follow.”
Emotional Reaction
Expressing how someone feels about doing something.
“I'm delighted to meet you.”
“She was surprised to see him there.”
Judgment and Character
Commenting on someone's behavior or character traits.
“It was kind of you to help.”
“It's rude to interrupt people.”
Necessity and Importance
Stating that an action is required or vital.
“It's important to arrive on time.”
“It is necessary to sign the form.”
Reference Table
| Adjetivo | Significado | Frase de Ejemplo | Enfoque |
|---|---|---|---|
|
Easy
|
No difícil
|
It's `easy to learn` new words.
|
easy to learn
|
|
Hard
|
Difícil, desafiante
|
It was `hard to solve` the puzzle.
|
hard to solve
|
|
Important
|
Significativo, necesario
|
It's `important to listen` carefully.
|
important to listen
|
|
Pleasant
|
Agradable, bonito
|
It's `pleasant to walk` in the park.
|
pleasant to walk
|
|
Impossible
|
No se puede hacer
|
It's `impossible to predict` the future.
|
impossible to predict
|
|
Exciting
|
Emocionante, estimulante
|
It's `exciting to start` a new project.
|
exciting to start
|
|
Glad
|
Feliz, complacido
|
I'm `glad to see` you again.
|
glad to see
|
Espectro de formalidad
It is quite straightforward to complete the application. (Completing a task)
It's easy to finish the form. (Completing a task)
It's a breeze to do. (Completing a task)
It's a piece of cake to knock out. (Completing a task)
Adjetivo + To-Infinitive: Tu Kit de Opiniones
Adjetivos Comunes
- Easy No difícil
- Hard Difícil
- Important Necesario
- Happy Contento
Infinitivos Comunes
- to do realizar una acción
- to understand captar el significado
- to say decir palabras
- to go partir
Patrón Principal
- It's easy to use Expresar opinión general
- She is happy to help Expresar sentimiento personal
Lo que hace
- Express Opinions Cómo te sientes sobre una acción
- Describe Characteristics Cómo es una acción
To-Infinitive vs. Gerundio Después de Adjetivos
¿Debo usar 'Adjective + To-Infinitive'?
¿Estás expresando una opinión o un sentimiento sobre una ACCIÓN?
¿La acción sigue a un adjetivo como 'easy', 'hard', 'important', 'happy'?
Adjetivos que Aman los To-Infinitives
Opinión/Característica
- • Easy
- • Hard
- • Difficult
- • Simple
- • Impossible
- • Possible
- • Good
- • Bad
- • Fun
- • Boring
- • Interesting
Emoción/Sentimiento
- • Happy
- • Glad
- • Sad
- • Pleased
- • Delighted
- • Excited
- • Surprised
- • Shocked
- • Upset
- • Angry
- • Disappointed
Necesidad/Importancia
- • Important
- • Necessary
- • Essential
- • Crucial
- • Vital
- • Obligatory
Ejemplos por nivel
I am happy to help you.
It is good to see you.
It is easy to read this.
She is sad to go.
It is important to drink water.
It is not easy to learn Chinese.
Are you ready to order?
It is dangerous to swim here.
It is difficult for me to speak in public.
It was very kind of you to invite us.
It is necessary to wear a helmet.
I was surprised to find the door open.
The results are likely to be positive.
It is vital not to underestimate the competition.
He is always the first to arrive at work.
The instructions are too complicated to follow.
It is imperative to address these issues immediately.
She was relieved to have finished the marathon.
It is quite common for students to feel overwhelmed.
The book is well worth the effort to read.
It is incumbent upon the board to ensure transparency.
The theory is far too abstract to be applied practically.
He was loath to admit that he had been mistaken.
It is seldom easy to reconcile such disparate views.
Fácil de confundir
Learners often use 'to' when a specific preposition is required by the adjective.
Both 'Learning is fun' and 'It is fun to learn' are correct, leading to choice paralysis.
Learners forget the 'to' after enough/too.
Errores comunes
It is easy learn.
It is easy to learn.
I am happy for see you.
I am happy to see you.
It is good to seeing you.
It is good to see you.
Is easy to go.
It is easy to go.
It is important to not forget.
It is important not to forget.
The book is easy for read.
The book is easy to read.
I am ready for go.
I am ready to go.
It is easy for me learning.
It is easy for me to learn.
It was kind for you to help.
It was kind of you to help.
I am sorry to being late.
I am sorry to be late.
It is easy that I learn.
It is easy for me to learn.
Patrones de oraciones
It is ___ to ___.
I am ___ to ___.
It is ___ for ___ to ___.
It was ___ of ___ to ___.
Real World Usage
It's great to hear from you!
I am eager to learn new skills.
It's easy to get lost in this city.
It's important to leave a note for the driver.
So happy to share this news!
It's necessary to take this twice a day.
Tipos de adjetivos para esto
good, bad, easy, hard, happy, sad, important, possible). Son tus aliados para esta estructura. "It's good to try new things."¡Trampa del gerundio vs. infinitivo!
to! Por ejemplo: "It's easy to learn, NO It's easy learning".Añadir 'Para quién'
for + noun/pronoun justo después del adjetivo! Como: "It's difficult for me to wake up early".Suena más natural
hará que tu inglés suene mucho más natural y conversacional al instante. Es una señal de fluidez, ¡así que practicalo seguido!It's great to talk to you."
Más allá de 'It's'
es muy común, recuerda que también puedes decirThe task was hard to complete
o He is difficult to work with". ¡No te limites!Smart Tips
Start your sentence with 'It's better to...' or 'It's important to...'. It sounds much more polite than a direct command.
Use the 'for [person]' bridge right after the adjective.
Always place 'not' as a guard in front of 'to'.
Switch 'for' to 'of' to sound more native when talking about someone's character.
Pronunciación
The 'to' reduction
In natural speech, 'to' is often reduced to a weak 'tuh' /tə/.
Linking 'is' and 'easy'
The 's' in 'is' links to the 'e' in 'easy', sounding like /ɪzi/.
Emphasis on the Adjective
It's EASY to learn. (Stress on EASY)
Emphasizing the quality of the action.
Memorízalo
Mnemotecnia
Remember: 'Adjectives are the bridge, and TO is the glue.'
Asociación visual
Imagine a bridge connecting a 'Happy Face' (Adjective) to a 'Running Man' (Verb). The bridge is labeled 'TO'.
Rhyme
When an adjective is in your view, follow it up with 'to' and do!
Story
A man named 'It' was very 'Happy'. He wanted 'to help' his friend. He found it 'easy to carry' the bags, but 'hard to walk' up the stairs.
Word Web
Desafío
Write 5 sentences about your day using 'It is [adjective] to [verb]'. Example: 'It is nice to drink coffee.'
Notas culturales
British speakers frequently use 'It's kind of you to...' as a polite way to say thank you or accept a gift.
American English often uses 'It's important to...' in business settings to be direct but professional.
This structure is preferred in international business because it is clear and avoids the ambiguity of some gerund phrases.
The 'to' particle in English originally indicated direction (like 'towards'). Over time, it became a marker for the infinitive verb.
Inicios de conversación
Is it easy to find good food in your city?
What is the most important thing to do for a healthy life?
Were you surprised to see how much technology has changed?
Is it rude to use your phone at the dinner table?
Temas para diario
Errores comunes
Test Yourself
It's so important ___ your friends.
Find and fix the mistake:
The book was difficult understanding.
Choose the correct sentence:
Translate into English: 'Es emocionante viajar a nuevos lugares.'
Answer starts with: ["I...
Score: /4
Ejercicios de practica
8 exercisesIt is important ___ (brush) your teeth every day.
Find and fix the mistake:
It is difficult for me learning English grammar.
Which sentence is correct?
not / to / important / it / is / forget / .
How do you say this in English?
Match: 1. Happy, 2. Hard, 3. Ready
A: 'I'm so nervous about the test.' B: 'Don't worry, it's ___.'
Identify the incorrect sentence.
Score: /8
Practice Bank
12 exercisesIt's often challenging ___ focused during long lectures.
I'm happy helping you with your project.
Choose the correct sentence:
Translate into English: 'Es imposible terminar esto hoy.'
Arrange these words into a sentence:
Match the adjectives with the correct action:
The movie was thrilling ___ from start to finish.
It's too late starting now.
Which sentence is correct?
Translate into English: 'Fue amable de tu parte invitarme.'
Arrange these words into a sentence:
Match the emotions with what they relate to:
Score: /12
Preguntas frecuentes (8)
Yes, both are correct. However, `It is easy to learn` is much more common in spoken English because it emphasizes the adjective first.
We use `of` when the adjective describes the person's character (kind, mean, brave). We use `for` when the adjective describes the difficulty or effect of the action (hard, easy, important).
In casual speech, people say this often. However, in formal writing, you should put `not` before `to`: 'It's important not to forget.'
Most adjectives work, especially those describing difficulty, emotions, or opinions. However, some adjectives like `interested` or `afraid` often prefer a preposition + gerund (afraid of falling).
If you aren't using a person as the subject (like 'I am happy'), then yes, English requires the 'dummy' subject `It`.
Just change the verb 'be' to the past tense: `It was easy to learn` or `I was happy to help.` The infinitive part (`to learn`) stays the same.
Yes! This is a common extension: `It is too hot to eat` or `He is old enough to drive.`
It is neutral. It is used in both very formal academic writing and very casual text messages.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Es fácil de [verbo]
Spanish uses 'de' or 'para' instead of 'to'.
C'est facile à [verbo]
French has two different particles (à/de) while English mostly uses 'to'.
Es ist leicht zu [verbo]
The 'zu' in German often comes at the very end of the clause.
[Verb] no wa kantan desu
Japanese uses nominalization particles instead of an infinitive marker.
Min al-sahli an [verb]
Arabic uses a 'that' (an) conjunction rather than a 'to' particle.
Hen rongyi [verb]
Chinese has no infinitive marker or 'dummy' subject.
Learning Path
Prerequisites
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