conditional + if

Conditional Sentences are also known as Conditional Clauses or If Clauses. They are used to express that the action in the main clause (without if) can only take place if a certain condition (in the clause with if) is fulfilled. There are three types of Conditional Sentences.

Conditional Sentence Type 1

→ It is possible and also very likely that the condition will be fulfilled.

Form: if + Simple Present, will-Future

Example: If I find her address, I’ll send her an invitation.


Conditional Sentence Type 2

→ It is possible but very unlikely, that the condition will be fulfilled.

Form: if + Simple Past, Conditional I (= would + Infinitive)

Example: If I found her address, I would send her an invitation.


Conditional Sentence Type 3

→ It is impossible that the condition will be fulfilled because it refers to the past.

NegativeIf + Past Perfect Tense, + S + Would/should/could/might + Have + Verb3 (Past participle)

OR

S + Would/should/could/might + Have + Verb3 (Past participle) + If + Past Perfect Tense if + condition
Example :
- If I had studied, I would have passed the exams.
- If I had studied, I could have passed the exams.
- If I had studied, I might have passed the exams.
- I would have passed the exams if I had studied.
- I could have passed the exams if I had studied.
- I might have passed the exams if I had studied.

Negative if + condition

The formula : if ... not can be replaced with UNLESS .

Examples of conditional sentence : if ... not and UNLESS :

Using the formula if negative , conditional sentence examples as below .

If the students do not understand , they will raise Reviews their hand to ask .

Unless the students understand , they will raise Reviews their hand to ask . ( If students do not understand , they will raise their hands to ask. )


Form: if + Past Perfect, Conditional II (= would + have + Past Participle)

Example: If I had found her address, I would have sent her an invitation.