1. Make sure all windows are closed.

2. Make certain all windows are closed.

3. Be certain all windows are closed.

4. Be certain that all windows are closed.

5. Be sure to come here in time.
6. Be certain to come here in time.

7 Make sure you don't smoke in this room.
8. Make certain you don't smoke in this room.

9. Make sure not to smoke in this room.
10. Make certain not to smoke in this room.

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Can we use all the expressions?
Are 'sure' and 'certain' interchangable in this case?

1 answer

Yes.