Auxiliary Verbs are verbs that merely help principal verbs in the formation of various verb forms. Auxiliary verbs are important as structural verbs.
Auxiliary Verbs are of two types: Primary Auxiliary Verbs and Modal Auxiliary Verbs. Following is a detailed discussion about the types of Modal Verbs.

Types of Modal Verbs
Modal Auxiliary Verbs are can, may, shall, will, must, ought to, used to, need, and dare. They do not have-s’ forms or -ed participles.
Can, may, shall, will, have special past forms (could, might, should, would), but the remainder (such as must) do not.
MODALS | FUNCTIONS | EXAMPLES |
Will | asking possibility suggestion | Will you go to school? It will rain today. You will not keep late hours at night before the exam. |
Would | requesting | Would you give me a pen? |
Shall | asking possibility | Shall I do the work? I hope I shall complete the project within a week. |
Should | suggest seeking advice | You should walk a mile in the morning. Should we go for a walk? |
Can | ability possibility | The boy can speak English fluently. We can hold a condolence meeting for his death this Sunday. |
Could | ability requesting | He could do the sum. Could you help me to solve the problem? |
May | possibility permission offering | He may come here today. May I come in? May I get you a cup of tea? |
Might | possibility suggestion | His statement might be true. You might just as well go. |
Must | obligation certainty strong probability prohibition | You must obey your teacher. Man must die one day. You must be tired after a long journey. We must not waste our time. |
Dare | have the courage challenge negative force interrogation | He dare not say so. (not dares’) I dare you to prove that you’ve said so. He dare not follow you. Who dares to enter the room? |
Need | prohibition interrogation | You need not (needn’t) come here. Need he go there? |
Used to | habitual action in the past | My father used to teach me English. |
Ought to | obligation strong likelihood | You ought to work hard. The lawyer ought to be able to help you. |
You Asked, We Listened – List of All Grammar Chapters Updated 😍😍
Also, Read

Main and Helping Verbs

24 Auxiliary Verbs List

Illative Conjunctions
