In English, we can express a lot of ideas using modal auxiliary verbs.
The modal auxiliary verbs are: will, would, can, could, may, might, must, ought to, need, used to and dare.
They express ideas such as possibility, permission, prohibition, obligation, necessity, duty, willingness etc.
Rewrite the following sentences using modal auxiliary verbs. Make sure that the meaning does not change.
1It is not necessary for you to wait any longer. / You ............... not wait any longer.
Wrong!
2You are required to respect the national flag. / You ............... respect the national flag.
Wrong!
3She was able to read when she was three. / She ............... write when she was three.
Wrong!
4I was able to solve the problem. / I ............... solve the problem.
Wrong!
5Perhaps she would come. / She ............... come.
Wrong!
6You are prohibited from entering my home. / You ............... enter my house.
Wrong!
7You are allowed to go home. / You ............... go home.
Wrong!
8She is able to speak English. / She ............... speak English.
Wrong!
9It is possible to blow glass. / Glass ............... be blown.
Wrong!
10It is not necessary for her to pay for that call. / She ............... pay for that call.
Wrong!
11It is possible for wars to break out at any time. / Wars ............... break out at any time.
Wrong!
12I prefer to stay at home instead of going to the club. / I ............... rather stay at home than go to the club.
Wrong!
Done.
Score: 0/12
Answers
- It is not necessary for you to wait any longer. / You need not wait any longer.
- You are required to respect the national flag. / You should respect the national flag.
- She was able to read when she was three. / She could write when she was three.
- I was able to solve the problem. / I could solve the problem.
- Perhaps she would come. / She might come.
- You are prohibited from entering my home. / You must not enter my house.
- You are allowed to go home. / You Either could be used here go home.
- She is able to speak English. / She can speak English.
- It is possible to blow glass. / Glass can be blown.
- It is not necessary for her to pay for that call. / She need not pay for that call.
- It is possible for wars to break out at any time. / Wars can break out at any time.
- I prefer to stay at home instead of going to the club. / I would rather stay at home than go to the club.

