Today we will learn about passive form of modals.
You can check the theory of modals here https://englishtips4u.com/2017/01/11/engclass-modal-verbs/
The passive form: modal + be + past participle

E.g

1. The new phone will be launched soon.

2. The window can’t be opened.

3. Fred is supposed to be told about the meeting.

4. This letter ought to be sent before March 25th.

5. The computer may be bought by me.

6. Decisions should not be made too quickly.

7. The athlete must be given time out.

8. The sunset could be seen very clearly yesterday.

The past-passive form: modal + have been + past participle

E.g.

1. The package should have been sent last week.

2. This tree must have been planted over 50 years ago.

3. John might have been told about the employment.

4. This house could have been built after the earthquake.

5. The crew should have been prepared to work hard.

Compiled and written by @sherlydarmali for @EnglishTips4U on Sunday, March 12, 2017.