What is the difference between a modal verb and a helping verb?

Modal verbs are used to express possibility, obligation, necessity, or probability. Helping verbs are used to provide additional information about a main verb.

Here are some examples of modal verbs and helping verbs:

| Modal Verb | Helping Verb | |---|---| | can | is helping | | must | is required | | should | should have | | may | might | | must | must have |

As you can see, modal verbs are used to express a wider range of ideas than helping verbs. Helping verbs are also used to provide more specific information about a main verb.