• + IF + S + VERB (present simple), S+ will/won't + verb (inf)
  -Ex: If I have time, I will help you

+ If + S + VERB (past simple), S+ would/wouldn't + verb (inf)
-Ex: *If I was rich, I hould have 5 cars

- If + S + don't/doesn't + VERB (inf), S + would/wouldn't + verb (inf)
-Ex: If I didn't have a boyfriend

We use FIRST CONDITIONAL to talk about the result of a passible situation in the future

• *+ IF + S + don't/doesn't +VERB ( inf), S + will/won't + verb (inf)
• Ex: If you don't study, you won't pass the exam

We use SECOND CONDITIONAL to talk about the result of on imaginary situation

We use THIRD CONDITIONAL to talk about the result of a situation in the past

+ If + S + had/hadn't + verb (participle), S + would have + verb (participle)
-Ex: If it had rained, you would have gotten wet

- If + S + had/hadn't + verb (participle), S + wouldn't have + verb (participle)
-Ex: He wouldn't have caught a cold if the heating hadn't been on so low