How to form conditional sentences

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Conditional Sentence Type 1

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

Form: if + Simple Presentwill-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 PastConditional 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.

 Form: if + Past PerfectConditional II (= would + have + Past Participle)

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