1. The other robber forced me back to the safe.

(What is the part of speech of 'back' in the sentence?)

2. He was carring the glass necklace and started down the stairs.

3. He was carring the glass necklace and started coming down the stairs.

4. He was carring the glass necklace and started going down the stairs.

5. He was carring the glass necklace and started moving down the stairs.
(What does #2 mean, #3, #4,or #5?)

1 answer

In 1, "forced back" is considered a phrasal verb. Here is a really good explanation:
http://grammar.ccc.commnet.edu/grammar/verbs.htm#phrasal
Click on HERE for a long list.

And here's another website where you can find lists and lists of these verb phrases:
http://www.eslcafe.com/pv/

Yes, 2 - 5 all mean about the same thing. NOTE THE SPELLING ~~> carrying