Question

1. Be sure (that) you arrive at work on time every morning.

2. Make sure (that) you arrive at work on time every morning.

3. Be sure to arrive at work on time every morning.

4. Make sure to arrive at work on time every morning.
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Are they all grammatical and the same?

Answer 1

Yes, they are. And the (that) us optional. It is implied and not necessary.