Linking verbs do not express action. Instead, they connect the subject of the verb to additional information about the subject.
- EX: Keila is a shopaholic.
- Ising isn't something that Keila can do.
- Is connects the subject, Keila, to additional information about her, that she will soon have a huge credit card bill to pay.
The following verbs are true linking verbs: any form of the verb be [am, is, are, was, were, has been, are being, might have been, etc.], become, and seem. These true linking verbs are always linking verbs.
If you can substitute am, is, or are and the sentence still sounds logical, you have alinking verb on your hands.If, after the substitution, the sentence makes no sense, you are dealing with an action verb instead