Main and Helping Verbs
The main verb shows the action in a sentence. The helping verb works with the main verb, helping to show whether the action in the sentence is in the past, present, or future. Am, is are, was, and were can be helping verbs. For example: I am talking to Mother. "Talking" is the main verb and "am" is the helping verb.
When is it happening? Make a list together of several action verbs. Then see if you can write three sentences for eacho ne of them, each one using a helping verb to show action happening int he past, present, and future. For example: We were cooking dinner. We are cooking dinner. Soon, we will be cooking dinner.