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should be cleaned
must be watered
may be picked
Find out the basic structure of passive voice with modal verbs .
含情态动词的被动语态的结构：
can
should
may
must
+ be done
能被...
应该被...
可能被...
必须被...
情态动词+助动词be +及物动词的过去分词(done)
I don't think sixteen-year-olds should be allowed to drive.
I agree.They aren't serious enough.
Do you think teenagers should be encouraged to make their own decisions?
No,I don't agree with this.Teenagers are too young to make their own decisions.
Teenagers should not be allowed to have part-time jobs.
I disagree.They can learn a lot from working.
Do you think we may be allowed o take photos if we don't use a flash?
If you don't use a flash,then it may be OK.
Grammar
Focus
Circle the structure of passive voice with modal verbs from these sentences.
My homework should be done (by me) every day.
My homework should not be done (by me) every day.
Should your homework be done (by you) every day?
肯定句