Sure! Here are the verbs in brackets put into the correct forms:

### Exercise 1:
1. If I **knew** that you were ill, I **would go** to see you.
2. I **saw** him if I **went** to the party last night.
3. What **would** (you) **do** if you **met** him?
4. If I **made** that mistake again, my teacher **would get** angry with me.
5. If I **went** to London yesterday, my **friend would have** had a strange sound.
6. My dog (bark) if it **heard** a strange sound.
7. If I **did not go** away, I **would send** the police.
8. If I **had** met you in your police, I **would accept** Mr. Anderson’s invitation.
9. I was busy. If I **had** free time, I **would go** to the cinema with you.
10. Why didn’t you **attend** the meeting? Oh, I **didn't know** if I **could come** there.

### Exercise 2:
1. It is not bad if Helen isn’t here. If she **were** here, she **would know** what to do.
2. If you **push** this red button, the TV **will turn off**.
3. I didn’t listen to the teacher. If he **had listened** carefully, he **would perform** well in the examination.
4. He’s waiting for his mother to come back from Chicago. If his mother **could come** home, he **would have** a lot of presents.
5. I wanted to buy some Christmas presents but he couldn’t. If he **afforded** to buy, his children **would be** very happy to greet a new year.
6. If she **wanted** (to buy) a computer **yesterday**, she **would have bought** one.
7. If he **brought** me another cake if he **did not like** this one.
8. She **said** (she) **would be** coming to see this tomorrow.

### Exercise 3:
He can’t go out because he has to study for his exam.