4. unless they invite me, I won't come

5, if he had revised all his lesson, he could have done the exercise

6, if my brother enough money, he will buy a bicycle

7, if he had had time, he would have read this novel

8, if she hadn't missed the bus, she wouldn't have been late

9, if i buy a new hat, I will give it to you

10, if today were sunday, the pupils could go camping

11, if he had been here, he would have had a lot of fun

12, if Windy had come, we wouldn't have cancelled the meeting

13, if he hadn't been angry, he would have said anything

14, unless you leave me alone, i will cll the police

15, should she see Peter tomorrow, she will tell him to come here

16, Were i to go to the party, i would meet him

23, Had Lisa not stayed up late last night, she wouldn't feel tired now

24, Had you asked him, he would have lent you his bike

(không chắc đúng hết, nhưng bạn có thể tham khảo, chúc bạn học tốt!)