How might you explain to a new student of English what is happening in such sentences as these?

Terry is in the library.
Terry may be in the library.
Terry might be in the library.
Terry might have been in the library.
Terry could be in the library.
Terry can be in the library.
Terry should be in the library.
Terry will be in the library.

1 answer

First of all, I'd explain that in English, the name of any language (including English!) has a capital first letter.

Then, I'd go to Dave's ESL Cafe website and go through all the lessons regarding the various tenses of verbs:
http://www.eslcafe.com/grammar.html

What would YOU do?