C1 Subjunctive 12 min read Medium

Conditional 'Caso' vs 'Se' (In Case vs If)

Use caso with the Present Subjunctive to sound professional and handle hypothetical future scenarios with elegance.
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Grammar Rule in 30 Seconds

Use 'se' for simple conditions (if) and 'caso' for precautionary measures (in case), always followed by the subjunctive.

  • Use 'se' + indicative/subjunctive for standard conditions: 'Se chover, não vou.'
  • Use 'caso' + future subjunctive for precautionary scenarios: 'Caso chova, levarei um guarda-chuva.'
  • Never use 'caso' with the indicative mood; it strictly requires the subjunctive.
Caso + [Subjuntivo] | Se + [Indicativo/Subjuntivo]

Overview

In Portuguese, expressing conditions extends beyond the simple 'if-then' structure you learned with se. At the C1 level, mastering the distinction between se and caso is essential for elevating your speech and writing from proficient to sophisticated. While both introduce a conditional clause, they operate in different registers and carry distinct nuances.

Se is the versatile, all-purpose tool for everyday conditions, hypotheticals, and general truths. Caso, conversely, is a specialist. It introduces a formal contingency or provision, functioning more like the English 'in the event that' or 'should'.

The fundamental difference is not just stylistic but also grammatical. Using se for future possibilities involves the Future Subjunctive (Se você for), a common pattern. However, caso forces the use of the Present Subjunctive (Caso você vá), even when discussing a future event.

This grammatical signature is a hallmark of educated, formal Portuguese. Understanding caso is not merely about learning a new word for 'if'; it's about learning a specific structure that signals preparedness, formality, and a higher degree of hypotheticality. It frames the condition not as a simple possibility, but as an eventuality for which one should be prepared.

How This Grammar Works

The core mechanism of caso revolves around its relationship with the subjunctive mood. The subjunctive is used to express actions or states that are subjective, uncertain, or hypothetical. While se can also partner with the subjunctive, caso makes this partnership exclusive and rigid.
It acts as a powerful trigger word that removes all ambiguity about which verb mood and tense to use.
Let's establish the central rule: the conjunction caso is always followed by a verb in the Present Subjunctive when referring to a potential future condition. It does not matter that the event is in the future; the caso itself projects the clause into a hypothetical realm, and the Present Subjunctive is the tense required to fulfill this grammatical function. Think of caso as absorbing the future uncertainty, leaving the verb to simply express the hypothetical action in its base subjunctive form.
The main clause that follows the caso condition typically expresses the consequence or instruction and is conjugated in the Present Indicative, Future Indicative, or the Imperative. This creates a clear and logical structure: a formal contingency is established, and a concrete result or action is stated.
Consider this comparison:
  • Standard Condition (se): Se você precisar de ajuda amanhã, me telefone. (If you need help tomorrow, call me.) - Uses the Future Subjunctive.
  • Formal Contingency (caso): Caso você precise de ajuda amanhã, me telefone. (In the event you need help tomorrow, call me.) - Uses the Present Subjunctive.
The meaning is nearly identical, but the tone shifts significantly. The caso construction feels more formal and prepared, as if the possibility has already been considered and a plan is in place. It's the preferred structure for official instructions, business correspondence, and legal documents where clarity and formal prudence are paramount.
Here's another example showing the main clause variation:
  • Caso haja qualquer problema, nós cancelamos o evento. (Present Indicative Result)
  • Caso haja qualquer problema, nós cancelaremos o evento. (Future Indicative Result)
  • Caso haja qualquer problema, cancele o evento. (Imperative/Command)

Formation Pattern

1
The structure for using caso is consistent and can be learned as a fixed formula. Mastering the Present Subjunctive conjugations is the only variable component.
2
The Formula:
3
Caso + [Subject] + [Verb in Present Subjunctive], + [Main Clause]
4
Main Clause Tense Options:
5
Present Indicative: To state a present-tense reaction or general procedure.
6
Future Indicative: To state a future consequence.
7
Imperative: To give a command or instruction based on the condition.
8
Present Subjunctive Conjugation
9
To form the Present Subjunctive, you typically take the eu form of the Present Indicative, drop the -o, and add the opposite vowel ending. For -ar verbs, this is -e. For -er and -ir verbs, this is -a.
10
| Verb Type | Present Indicative eu | Stem | Subjunctive Endings | Example (falar) | Example (vender) | Example (partir) |
11
|---|---|---|---|---|---|---|
12
| -ar | falo | fal- | -e, -es, -e, -emos, -eis, -em | fale | | |
13
| -er | vendo | vend- | -a, -as, -a, -amos, -ais, -am | | venda | |
14
| -ir | parto | part- | -a, -as, -a, -amos, -ais, -am | | | parta |
15
Of course, many of the most common verbs are irregular. Memorizing their Present Subjunctive forms is critical for using caso correctly.
16
Common Irregular Verbs in the Present Subjunctive
17
| Pronoun | ser (to be) | estar (to be) | ir (to go) | ter (to have) | fazer (to do) | saber (to know) | querer (to want) |
18
|---|---|---|---|---|---|---|---|
19
| eu/você/ele/ela | seja | esteja | vá | tenha | faça | saiba | queira |
20
| nós | sejamos | estejamos | vamos | tenhamos| façamos | saibamos | queiramos |
21
| vocês/eles/elas| sejam | estejam | vão | tenham | façam | saibam | queiram |
22
Sentence Examples:
23
With a regular verb: Caso a empresa aceite a proposta, iniciaremos o projeto na segunda-feira. (Should the company accept the proposal, we will start the project on Monday.)
24
With an irregular verb: Caso você vá ao Rio de Janeiro, não se esqueça de visitar o Pão de Açúcar. (In case you go to Rio de Janeiro, don't forget to visit Sugarloaf Mountain.)
25
With a different main clause: Caso o sistema apresente um erro, reinicie o computador imediatamente. (If the system shows an error, restart the computer immediately.)

When To Use It

While grammatically straightforward, the stylistic use of caso requires nuance. Deploying it in the wrong context can make you sound overly formal or even robotic. Reserve it for situations where a degree of formality, politeness, or officiality is intended.
1. Formal and Business Communication
This is the primary territory for caso. It is standard in business emails, official reports, contracts, and presentations. It conveys professionalism and precision.
  • Email Example: Prezados, envio a ata da reunião. Caso haja alguma objeção ou correção, por favor, me informem até o final do dia. (Dear all, I am sending the meeting minutes. Should there be any objections or corrections, please inform me by the end of the day.)
2. Instructions, Warnings, and Procedures
Caso is ideal for user manuals, public signage, safety warnings, and application instructions. It frames the condition as a planned-for eventuality, making the instruction clear and direct.
  • Safety Sign: Caso sinta cheiro de gás, não acenda a luz e abra as janelas. (In the event you smell gas, do not turn on the light and open the windows.)
  • Website Instruction: Caso não receba o e-mail de confirmação em cinco minutos, verifique sua caixa de spam. (If you do not receive the confirmation email within five minutes, please check your spam folder.)
3. Polite and Considerate Suggestions
In social situations, using caso can soften a suggestion or offer, making it sound more considerate and less presumptive than se. It respects the other person's autonomy by framing the situation as purely hypothetical.
  • Offering Help: Eu vou ao supermercado mais tarde. Caso precise de alguma coisa, é só me mandar uma mensagem. (I'm going to the supermarket later. In case you need anything, just send me a message.) This feels slightly more polite than Se você precisar....
4. Academic and Technical Writing
In academic papers, theses, and technical documents, caso helps maintain a formal, objective, and detached tone. It is used to posit hypotheses or discuss potential outcomes in a structured manner.
  • Academic Text: A metodologia proposta é robusta. Caso os dados coletados divirjam das previsões iniciais, a hipótese nula será reforçada. (The proposed methodology is robust. Should the collected data diverge from the initial predictions, the null hypothesis will be reinforced.)

Common Mistakes

Learners at the C1 level often understand the concept of caso but fall into predictable error patterns, usually due to interference from the more common se structures.
Mistake #1: Using the Future Subjunctive or Infinitive
This is the most frequent error. Because the condition is in the future, learners instinctively reach for the Future Subjunctive or the Personal Infinitive, as they would with se or para. This is incorrect.
  • Incorrect: Caso você precisar de algo... (Infinitive)
  • Incorrect: Caso você for ao evento... (Future Subjunctive of ir)
  • Correct: Caso você precise de algo, me avise.
  • Correct: Caso você vá ao evento, nos encontraremos lá.
Mistake #2: Redundancy with Se (Se caso...)
In an attempt to be correct, some speakers combine se and caso. This is a common hypercorrection and is grammatically redundant. They are mutually exclusive; you must choose one.
  • Incorrect: Se caso chover, o jogo será cancelado.
  • Correct: Se chover, o jogo será cancelado.
  • Correct: Caso chova, o jogo será cancelado.
Mistake #3: Using Caso for Factual or General Conditions
Caso is reserved for contingencies, not for scientific laws or general truths. Using it in this context sounds illogical to a native speaker. For these situations, se is the only appropriate choice.
  • Incorrect: Caso a temperatura caia abaixo de 0°C, a água congela.
  • Correct: Se a temperatura cai abaixo de 0°C, a água congela. (Here, se means 'whenever').
Mistake #4: Confusion with the Noun caso
Caso is also a masculine noun meaning 'case'. This can lead to confusion. The conjunction caso introduces a clause with a conjugated verb. The noun is used in phrases like neste caso (in this case) or em caso de (in case of), which is followed by a noun.
  • Correct (Conjunction): Caso chova, temos um plano B.
  • Correct (Noun): Em caso de chuva, temos um plano B.
Mistake #5: Overusing It in Casual Conversation
While caso can be used for politeness, peppering it throughout a casual WhatsApp chat will make you sound stilted or even ironic. Context is everything. Unless you're being intentionally formal or gently polite, stick to se for everyday interactions with friends.

Real Conversations

Observing caso in authentic contexts helps solidify its use case. Notice how the register and relationship between speakers influence the choice.

S

Scenario 1

At the Office (Email)
S

Subject

Proposta Cliente XYZ*

Olá equipe,

Anexei a versão final da proposta para o cliente XYZ. Por favor, revisem o documento.

Caso encontrem algum erro ou tenham alguma sugestão de melhoria, me avisem até as 15h. O prazo final para envio é amanhã de manhã.

Obrigado,

Gerente do Projeto

Here, Caso encontrem sets a formal, procedural tone appropriate for a work directive.*

S

Scenario 2

Technical Support (Website Chat)
U

User

* Meu aplicativo não está abrindo desde a última atualização.
S

Support

* Entendido. Por favor, tente limpar o cache do aplicativo. Caso o problema persista, será necessário reinstalar o aplicativo. Por favor, faça um backup dos seus dados antes.

Caso o problema persista is a standard, formal way to give sequential instructions based on a contingency.*

S

Scenario 3

Polite Offer Between Acquaintances
P

Person A

* Que legal que você vai se mudar para Lisboa! A cidade é incrível.
P

Person B

* Sim, estou muito animado! Mas um pouco nervoso com a burocracia.
P

Person A

* Eu imagino. Morei lá por dois anos. Caso queira umas dicas sobre como conseguir o NIF ou abrir conta em banco, posso te mandar umas notas.

Using Caso queira makes the offer of help sound less intrusive and more genuinely considerate.*

S

Scenario 4

Ironic or Humorous Texting Between Friends
F

Friend 1

* Nossa, a prova de cálculo amanhã vai ser impossível. 💀
F

Friend 2

* Total. Já estou me preparando psicologicamente para o fracasso.
F

Friend 1

* Hahaha. Caso eu não sobreviva, diga à minha gata que eu a amava.

The humor comes from using the highly formal Caso eu não sobreviva to describe exam stress, creating a deliberately dramatic and ironic effect.*

Quick FAQ

Q: Can I use caso to talk about the past?

Not in the structure we've discussed. The caso + Present Subjunctive formula is for future contingencies. To speculate about a past event, you would more commonly use se with the Imperfect Subjunctive (Se eu soubesse...) or other structures. However, you can use caso with the Present Perfect Subjunctive to speculate about a recent past event that has relevance to the present. For example: Caso você tenha recebido uma cobrança indevida, entre em contato conosco. (In the event you have received an incorrect charge, contact us.)

Q: What is the difference between caso and no caso de?

This is a key distinction. Caso is a conjunction and must be followed by a clause with a conjugated subjunctive verb. No caso de is a prepositional phrase and must be followed by a noun or an infinitive verb.

  • Caso chova... (Followed by conjugated verb)
  • No caso de chuva... (Followed by noun)
  • No caso de chover... (Followed by infinitive)
All three are correct and mean 'In case it rains...', but they are not grammatically interchangeable.
Q: Is caso que a valid phrase?

No. Unlike other conjunctions like contanto que or desde que, caso never takes que. It stands alone.

Q: Does the position of the caso clause change the punctuation?

Yes. When the caso clause begins the sentence, it is separated from the main clause by a comma. If the main clause comes first, no comma is needed.

  • Caso chova, o evento será dentro do salão.
  • O evento será dentro do salão caso chova.
Q: How do I choose between se, caso, and contanto que?

They establish different types of conditions:

  • Se (If): The most neutral and versatile. Used for general conditions, real possibilities, and hypotheticals in all registers.
  • Caso (In the event that, should): A formal contingency. Used to signal preparedness for a potential future event, common in formal, instructional, or very polite contexts.
  • Contanto que (As long as, provided that): A strict prerequisite. It sets a necessary condition that must be met for the main clause to be true. Example: Você pode usar meu carro, contanto que o devolva com o tanque cheio. (You can use my car, provided that you return it with a full tank.)

Conjunction Usage

Conjunction Mood Required Nuance Formality
Se
Indicative/Subjunctive
Condition
Neutral
Caso
Future Subjunctive
Precaution
Formal

Meanings

These particles introduce conditional clauses. 'Se' establishes a direct condition, while 'caso' implies a contingency or precaution.

1

Precautionary

Used to express an action taken in anticipation of a potential future event.

“Caso ele chegue cedo, avise-me.”

“Caso não goste, podemos trocar.”

2

Conditional

Standard 'if' condition.

“Se eu pudesse, iria.”

“Se você quiser, vamos.”

Reference Table

Reference table for Conditional 'Caso' vs 'Se' (In Case vs If)
Form Structure Example
Affirmative
Se + Indicative
Se chove, fico em casa.
Affirmative
Caso + Fut. Subj.
Caso chova, levarei capa.
Negative
Se + não + Indic.
Se não chover, sairemos.
Negative
Caso + não + Fut. Subj.
Caso não chova, sairemos.
Question
Se + ...?
Se você for, eu vou?
Question
Caso + ...?
Caso você vá, eu vou?

Formality Spectrum

Formal
Caso necessite de auxílio, contate-me.

Caso necessite de auxílio, contate-me. (Asking for help)

Neutral
Se precisar de ajuda, me ligue.

Se precisar de ajuda, me ligue. (Asking for help)

Informal
Se precisar de ajuda, me dá um toque.

Se precisar de ajuda, me dá um toque. (Asking for help)

Slang
Se precisar, dá um salve.

Se precisar, dá um salve. (Asking for help)

Conditional Logic

Condition

Direct

  • Se If

Precaution

  • Caso In case
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Examples by Level

1

Se eu puder, vou.

If I can, I will go.

1

Se você quiser, comemos pizza.

If you want, we'll eat pizza.

1

Se eu tivesse tempo, leria mais.

If I had time, I would read more.

1

Caso você precise, estou aqui.

In case you need it, I am here.

1

Caso surjam problemas, informe-nos.

In case problems arise, inform us.

1

Caso venha a ocorrer, tomaremos medidas.

Should it occur, we will take measures.

Easily Confused

Conditional 'Caso' vs 'Se' (In Case vs If) vs Se vs. Caso

Learners use them interchangeably.

Conditional 'Caso' vs 'Se' (In Case vs If) vs Future Subjunctive vs. Personal Infinitive

They look identical for regular verbs.

Conditional 'Caso' vs 'Se' (In Case vs If) vs Indicative vs. Subjunctive after 'Se'

Learners don't know when to use subjunctive.

Common Mistakes

✗

Caso eu vou

✓

Caso eu vá

Caso requires subjunctive.
✗

Se eu vá

✓

Se eu vou

Se often takes indicative.
✗

Caso chove

✓

Caso chova

Subjunctive needed.
✗

Se chova

✓

Se chove

Indicative is standard here.
✗

Caso você tem

✓

Caso você tenha

Subjunctive required.
✗

Se ele vir

✓

Se ele vier

Verb conjugation error.
✗

Caso ele faz

✓

Caso ele faça

Subjunctive required.
✗

Caso eles virem

✓

Caso eles vierem

Future subjunctive form.
✗

Se eu teria

✓

Se eu tivesse

Imperfect subjunctive needed.
✗

Caso nós vamos

✓

Caso nós formos

Future subjunctive.
✗

Caso ele chegaria

✓

Caso ele chegue

No conditional in 'caso' clause.
✗

Se caso chover

✓

Caso chova

Redundant 'se'.
✗

Caso ele tenha ido

✓

Caso ele vá

Wrong tense.
✗

Se ele chegaria

✓

Se ele chegasse

Wrong mood.

Sentence Patterns

Caso você ___, me avise.

Se eu ___, eu faria isso.

Caso não ___, ligue para mim.

Se você ___, eu vou também.

Real World Usage

Email very common

Caso haja dúvidas, contate-nos.

Texting constant

Se você chegar, me avisa.

Job Interview common

Caso eu seja contratado, darei o meu melhor.

Travel occasional

Caso perca o voo, ligue para a agência.

Food Delivery common

Se não tiver molho, não quero.

Legal Document very formal

Caso o contrato seja violado...

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💡

The 'Caso' Rule

Always pair 'caso' with the future subjunctive. It's the most common mistake.
⚠️

Avoid Redundancy

Don't say 'Se caso'. It's redundant and considered poor style.
🎯

Formal Writing

Use 'caso' in professional emails to sound more polished.
💬

Colloquial Usage

In Brazil, 'se' is used for almost everything. Don't be surprised if you rarely hear 'caso' in casual speech.

Smart Tips

Swap 'se' for 'caso' to sound more professional.

Se você tiver dúvidas, me avise. → Caso você tenha dúvidas, avise-me.

Always double-check the future subjunctive form of irregular verbs.

Caso você fazer... → Caso você fizer...

Stick to 'se' to avoid sounding stiff.

Caso você queira ir... → Se você quiser ir...

Delete 'caso' immediately.

Se caso chover... → Se chover...

Pronunciation

/ˈka.zu/

Stress

The stress in 'caso' is on the first syllable.

Conditional rise

Se você for, ↗ eu vou.

Rising intonation on the condition clause.

Memorize It

Mnemonic

Caso is for Caution. Se is for Simple.

Visual Association

Imagine a 'C' for 'Caso' as a closed umbrella (precaution) and an 'S' for 'Se' as a straight path (simple condition).

Rhyme

Caso is for the future plan, Se is for the simple man.

Story

Maria carries an umbrella (Caso) in case it rains. She says 'Se' (if) it rains, she will stay inside. She uses 'Caso' for the precaution and 'Se' for the condition.

Word Web

SeCasoSubjuntivoCondiçãoPrecauçãoFuturo

Challenge

Write 3 sentences using 'Caso' and 3 using 'Se' today.

Cultural Notes

Brazilians often use 'se' even in formal contexts, making 'caso' sound very sophisticated.

European Portuguese speakers use 'caso' more frequently in formal writing.

Usage follows standard formal patterns similar to Portugal.

Both derive from Latin: 'se' from 'si', 'caso' from 'casus' (event).

Conversation Starters

“

Caso você ganhe na loteria, o que faria?

“

Se você pudesse viajar agora, para onde iria?

“

Caso surja uma oportunidade de emprego, você aceitaria?

“

Se você tivesse um superpoder, qual seria?

Journal Prompts

Escreva sobre seus planos para o futuro, usando 'caso' para precauções.
Escreva um cenário hipotético sobre um mundo sem internet.
Escreva um e-mail formal para um chefe sobre um projeto.
Descreva o que você faria se fosse presidente.

Common Mistakes

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

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Test Yourself

Fill in the blank.

Caso você ___ (vir), me avise.

✓ Correct! ✗ Not quite. Correct answer: vier
Future subjunctive of 'vir' is 'vier'.
Choose the correct form. Multiple Choice

Se eu ___ (ter) dinheiro, compraria um carro.

✓ Correct! ✗ Not quite. Correct answer: tivesse
Imperfect subjunctive for hypothetical.
Find the error. Error Correction

Find and fix the mistake:

Caso ele chega cedo, avise-me.

✓ Correct! ✗ Not quite. Correct answer: chega
Should be 'chegue'.
Transform to formal. Sentence Transformation

Se você precisar, me ligue.

✓ Correct! ✗ Not quite. Correct answer: Caso precise, ligue-me.
Formal uses 'caso' + subjunctive.
Match the sentence to its mood. Match Pairs

Match each item on the left with its pair on the right:

✓ Correct! ✗ Not quite. Correct answer: Indicative / Subjunctive
Se is flexible, Caso is not.
Fill in the blank.

Se você ___ (quer), vamos.

✓ Correct! ✗ Not quite. Correct answer: quer
Present indicative for real condition.
Choose the correct form. Multiple Choice

Caso eles ___ (fazer) o trabalho, pagaremos.

✓ Correct! ✗ Not quite. Correct answer: fizerem
Future subjunctive plural.
Find the error. Error Correction

Find and fix the mistake:

Se caso você for, eu vou.

✓ Correct! ✗ Not quite. Correct answer: caso
Redundant.

Score: /8

Practice Exercises

8 exercises
Fill in the blank.

Caso você ___ (vir), me avise.

✓ Correct! ✗ Not quite. Correct answer: vier
Future subjunctive of 'vir' is 'vier'.
Choose the correct form. Multiple Choice

Se eu ___ (ter) dinheiro, compraria um carro.

✓ Correct! ✗ Not quite. Correct answer: tivesse
Imperfect subjunctive for hypothetical.
Find the error. Error Correction

Find and fix the mistake:

Caso ele chega cedo, avise-me.

✓ Correct! ✗ Not quite. Correct answer: chega
Should be 'chegue'.
Transform to formal. Sentence Transformation

Se você precisar, me ligue.

✓ Correct! ✗ Not quite. Correct answer: Caso precise, ligue-me.
Formal uses 'caso' + subjunctive.
Match the sentence to its mood. Match Pairs

Se chover / Caso chova

✓ Correct! ✗ Not quite. Correct answer: Indicative / Subjunctive
Se is flexible, Caso is not.
Fill in the blank.

Se você ___ (quer), vamos.

✓ Correct! ✗ Not quite. Correct answer: quer
Present indicative for real condition.
Choose the correct form. Multiple Choice

Caso eles ___ (fazer) o trabalho, pagaremos.

✓ Correct! ✗ Not quite. Correct answer: fizerem
Future subjunctive plural.
Find the error. Error Correction

Find and fix the mistake:

Se caso você for, eu vou.

✓ Correct! ✗ Not quite. Correct answer: caso
Redundant.

Score: /8

Practice Bank

12 exercises
Fill in the blank. Fill in the Blank

Caso eles ___ (ter) tempo, participarão da reunião.

✓ Correct! ✗ Not quite. Correct answer: tenham
Fix the sentence. Error Correction

Se você queira café, me diga.

✓ Correct! ✗ Not quite. Correct answer: Se você quiser café, me diga.
Reorder the words to form a correct sentence. Sentence Reorder

precisarem / caso / ajuda / de / avisem / me

✓ Correct! ✗ Not quite. Correct answer: Me avisem caso precisem de ajuda
Translate to Portuguese using 'Caso'. Translation

In case it rains, we will stay home.

✓ Correct! ✗ Not quite. Correct answer: Caso chova, ficaremos em casa.
Choose the best formal option. Multiple Choice

Select the professional phrase:

✓ Correct! ✗ Not quite. Correct answer: Caso haja problemas, avise.
Match the conjunction with the correct verb form. Match Pairs

Match:

✓ Correct! ✗ Not quite. Correct answer: Caso -> vá
Fill in the blank. Fill in the Blank

Caso ela ___ (saber) a verdade, ficará triste.

✓ Correct! ✗ Not quite. Correct answer: saiba
Fix the formal sentence. Error Correction

Caso você souber de algo, me fale.

✓ Correct! ✗ Not quite. Correct answer: Caso você saiba de algo, me fale.
Reorder correctly. Sentence Reorder

esqueça / caso / a / senha / clique / aqui

✓ Correct! ✗ Not quite. Correct answer: Clique aqui caso esqueça a senha
Translate using 'Se'. Translation

If they arrive early, wait for them.

✓ Correct! ✗ Not quite. Correct answer: Se eles chegarem cedo, espere.
Identify the incorrect usage. Multiple Choice

Which one is WRONG?

✓ Correct! ✗ Not quite. Correct answer: Caso você for...
Fill in the blank. Fill in the Blank

Caso o Uber ___ (chegar), me chame.

✓ Correct! ✗ Not quite. Correct answer: chegue

Score: /12

FAQ (8)

No, 'caso' strictly requires the subjunctive mood.

No, 'se' can take the subjunctive in hypothetical or contrary-to-fact conditions.

It's a common colloquial redundancy, but avoid it in writing.

Use it in formal writing or when you want to emphasize precaution.

It translates to 'if' but carries the nuance of 'in case'.

It's a verb form used to express future uncertainty, essential after 'caso'.

Yes, but 'caso' is more precise for that specific nuance.

The grammar is the same, but 'caso' is used more frequently in formal writing there.

Scaffolded Practice

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1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

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In Other Languages

Spanish high

en caso de que

Portuguese uses 'caso' directly, Spanish adds 'en' and 'de que'.

French moderate

au cas où

French uses conditional mood, Portuguese uses subjunctive.

German moderate

falls

German does not require the subjunctive mood here.

Japanese low

baai

Word order is completely different.

Arabic moderate

fi hal

Arabic grammar is non-conjugational in this specific structure.

Chinese low

ruguo

Chinese lacks mood conjugation entirely.

Learning Path

Prerequisites

Next
Conditional Provisions: 'As Long As' (Contanto Que)

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