A modal sentence contains modal verbs which are those verbs that are used to express certainty and necessity.
Expression of correct modal sentences
The following sentences are written in the correct modal forms:
We are obliged to look after the environment;
- we must look after the environment.
The students are obliged to take exams in June.
- The students must take exams in June.
Is it possible to show me how to use this printer, sir?
- can you show me how to use this printer, sir?
He doesn't have permission to come to the meeting.
- He shall not have permission to come to the meeting.
I recommend that we recycle more often
- I insist that we must recycle more often.
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