Sometimes verbs receive help from other verbs. Helping verbs helps the main verbs to express degrees of time and mood. Will, might, can, and need are helping verbs. In the sentence, “I need to go now,” need is the helping verb and adds strength to the verb, go.  If a helping verb is next to an –‘ing’ verb, you have a helping verb.

Below are the helping verbs. You can conjugate be, do, and have. Helping verbs can be used with another verb to express a mood:  can, could, may, might, must, shall, should, will, and would.

        He could help his mom if he wanted to.

        I might go to the beach.

        You should speak politely.

        They will be home soon.

        He is working on his paper. (is helps working)

https://en.wikipedia.org/wiki/Auxiliary_verb