
Originally Posted by
fantastic
1- The state is at least twice as big as England. (at least is a degree adverb) I looked up the dictionaries in the net and they didn't write which category it belongs to.
The phrase at least is an adjective modifying twice as big. It means at a minimum.

Originally Posted by
fantastic
2- john kept eating chocolate.(so kept is acting as a verb be) is there other words like this one?.
Here it is a verb meaning continued, thus:
John continued eating chocolate.

Originally Posted by
fantastic
3- everything we do is for our advantage.( everything and we are pronouns. How come they come together.
Everything we do is a noun phrase. It means all that we do.

Originally Posted by
fantastic
4- He likes to read books. (to read is direct object)(books indirect object)
The word books is a direct object there.

Originally Posted by
fantastic
5- sorry if I kept you waiting.(waiting is adjective).
The word waiting is a verb. It is what the person was doing.