1.if she doesn't start at once,she will be late

2.we would go on holiday if we had enough money

3.if you don't do these exercises more carefully,you will fail the exam

4.if i knew the answer,i could tell you

5.if she knew French,she could apply for the job

6.if it rains soon,the tree will die

7.if he knew her phone,he could phone her

8.if Tom were in my place,he would understand

9.if it weren't raining,we could go

=>
1. If she doesn't start at once, she will be late.
2. We would go on holiday if we had enough money.
3. If you don't do these exercises more carefully, you will fail the exams.
4. If I knew the answer, I could tell you.
5. If she knew French, she could apply for the job.
6. If it doesn't rain soon, the trees will die.
7. If he knew her phone number, he could phone her.
8. If Tom were in my place, he would understand.
9. If it weren't raining, we could go.

Câu điều kiện loại 1 :

If S + Vs/es, S + will/can V.

Câu điều kiện loại 2 :

If S + V2/ed, S + would/could V.