The Zero Conditional
We can make a zero conditional sentence with two present simple verbs (one in the 'if clause' and one in the 'main clause'):
- If + present simple, .... present simple.
- If people eat too much, they get fat.
- If you touch a fire, you get burned.
- People die if they don't eat.
- You get water if you mix hydrogen and oxygen.
- Snakes bite if they are scared
The First Conditional
- if + present simple, ... will + infinitive
- If it rains, I won't go to the park.
- If I study today, I'll go to the party tonight.
- If I have enough money, I'll buy some new shoes.
- She'll be late if the train is delayed.
- She'll miss the bus if she doesn't leave soon.
The Second Conditional
The second conditional uses the past simple after if, then 'would' and the infinitive:
- if + past simple, ...would + infinitive
- If I won the lottery, I would buy a big house.(I probably won't win the lottery)
- If I met the Queen of England, I would say hello.
- She would travel all over the world if she were rich.
- She would pass the exam if she ever studied.(She never studies, so this won't happen)
- If I had his number, I would call him. (I don't have his number now, so it's impossible for me to call him).
The Third Conditional
- if + past perfect, ...would + have + past participle
- If I hadn't eaten so much, I wouldn't have felt sick (but I did eat a lot, and so I did feel sick).
- If we had taken a taxi, we wouldn't have missed the plane
- She wouldn't have been tired if she had gone to bed earlier
- She would have become a teacher if she had gone to university
- He would have been on time for the interview if he had left the house at nine