The third person form of go is slightly irregular. An es
is added to the end of the main form- goes.
The present progressive form of 'go' is often
used to express future actions.
We've already seen how that can be used to attach a
clause to a sentence. The interogative pronouns who, whom,
whose, which, and where are also used in
this manner. In the following sentences you can either use who, whom
and which or you could use that. Who and
whom are used with people and which is used with
things.
Whose shows possession and where shows location.
The past progressive is used to express a past activity that was
interrupted.