Please explain Verb form and verb tense in this sentence:

8b. Since American Idol premiered on television, many talented contestants appeared on the show.

http://grammar.ccc.commnet.edu/grammar/index2.htm

Scroll down, and in the right-hand column, you'll find several links to information about verbs and verb tenses.

Let us know what you come up with, and we'll be happy to comment.

=)