Conditional Sentences

Conditional Sentences Type I
Conditional sentences type I use a structure for talking about possibilities in the present or in the future. The pattern is: If + simple present, will (future) 

• If I have a lot of money, I will go to London.
• If it's sunny, we'll go to the beach.
• If you invite us, we'll come to your wedding party.
• If she has enough time, she will come to your house.

Conditional Sentences Type II 

Conditional sentences type II use a structure for talking about unreal situations in the present or in the future. The pattern is: If + simple past, conditional I (would+infinitive) 

• If I were you, I would buy that car.
• If I had a lot of money, I would go to Bali. (Since I do not have a lot of money, I can not go to Bali).

Conditional Sentences Type III 

Conditional sentences type III use a structure for talking about unreal situations in the past. in other words, it is used to talk about things which did not happen in the past. The pattern is: If + past perfect, conditional II (would+have+past participle)

• If you had driven more carefully, you wouldn't have an accident.
• If I had known your address, I would have gone to your house.
• If I had a lot of money, I would have gone to Milan. (But I didn't have it, so I didn't go to Milan).