IF-Clauses – Topic

If-Clauses são também chamadas de frases condicionais (Conditional Sentences). São frases que apresentam uma condição: 

If = “se”

São divididas em 3 tipos básicos.

  • Type I
  • Type II
  • Type III

Nessa aula veremos os 3 tipos básicos e iremos além deles também.

TYPE I

As frases condicionais do Tipo I são aquelas que indicam grande chance de algo acontecer ou grande chance de que algo se realize. 

Affirmative
Exemplo 1 – If you study (present) hard, you will pass (future).

Negative 
Exemplo 2 – If you don’t study (present) hard, you won’t pass (future). 

Affirmative + Negative
Exemplo 3 – If you don’t study (present), you will fail (future). 
Exemplo 4 – If you study (present), you won’t fail (future).

TYPE II

As frases condicionais do Tipo II indicam pouca chance de algo acontecer ou que algo é possível que se realize.

Affirmative
Exemplo 1 – If you studied (past), you would pass (would + verb). 

Negative
Exemplo 2 – If you didn’t study (past), you wouldn’t pass (would + verb). 

Affirmative + Negative
Exemplo 3 – If you didn’t study (past), you would fail (would + verb). 
Exemplo 4 – If you studied (past), you wouldn’t fail (would + verb).

TYPE III

As frases condicionais do Tipo III indicam algo impossível de se realizar. Também podemos dizer que o Tipo III indica uma possibilidade irreal.  

Affirmative
Exemplo 1 – If you had studied (past perfect), you would have passed (would have + verb). 

Negative
Exemplo 2 – If you hadn’t studied (past perfect), you wouldn’t have passed (would have + verb). 

Affirmative + Negative
Exemplo 3 – If you hadn’t studied (past perfect), you would have failed (would have + verb). 
Exemplo 4 – If you had studied (past perfect), you wouldn’t have failed (would have + verb).

TYPE 0

As frases condicionais do Tipo 0 indicam que o resultado é sempre certo. Nesse tipo de frase condicional usamos o Simple Present em ambos os lados da frase. Veja os exemplos:
Exemplo 1 – If water reaches 100ºC, it boils.
Exemplo 2 – If you touch fire, you get burned. 

SPECIAL CASES

  1. “SE EU FOSSE VOCÊ” 
    O verbo To Be no passado usado numa frase condicional sempre será WERE. 
    • If I were you, I would talk to her.
  2. MIXED CONDITIONALS
    Podemos misturar os casos anteriormente citados dependendo do que queremos dizer. 
    • If I had taken an aspirin, I wouldn’t have a headache now.
    • had taken = Past Perfect (type 3)
    • wouldn’t have = Conditional (type 2)

SUBSTITUINDO IF

If pode ser substituído por palavras  ou expressões com um significado similar. As mais comuns são:

  • as long as
  • assuming (that)
  • on condition (that)
  • on the assumption (that)
  • provided (that)
  • supposing (that)
  • unless
  • with the condition (that)