This is a 31 slide powerpoint that goes over what a verb is and then talks about the verbs am, is, are, was, and were. It also has practice slides where students would pick between 2 of the linking verbs.
This powerpoint does not call them linking verbs. It does talk about am, is, and are being in the present form and was and were in the past. It also shows which ones go with the singular and plural nouns.