Question

1. Who allowed you to come in here?
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Is 'in' an adverb or a preposition?
Is 'here' a noun or an adverb?

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2. Do not drive, sending text messages.
3. Do not drive and send text messages.
4. Do not drive while sending text messages.
5. Do not drive while you are sending text messages.
6. Do not drive while you send text messages.
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Are they all the same in meaning? Does #2 mean #5 or #6?

Answer 1

In 1, "come in" is a phrasal verb, so "in" is an adverb. The word "here" is an adverb, too. Both words indicate place or direction.

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#4 is the best; #s 5 and 6 are next best; #s 2 and 3 are okay, but not as good as the others.