There are three classes of verbs in English:
1. The auxiliary verbs: DO, BE, AND HAVE
These are used to form tenses, and to show forms such as questions and negatives. They are dealt with in this unit.
2. Modal auxiliary verbs: MUST, CAN, SHOULD, MIGHT, WILL, AND WOULD
They help other verbs, but unlike do, be, and have, they have their own meanings. for example, must expresses obligation and can expresses ability.
3. Full verbs
1. The auxiliary verbs: DO, BE, AND HAVE
These are used to form tenses, and to show forms such as questions and negatives. They are dealt with in this unit.
2. Modal auxiliary verbs: MUST, CAN, SHOULD, MIGHT, WILL, AND WOULD
They help other verbs, but unlike do, be, and have, they have their own meanings. for example, must expresses obligation and can expresses ability.
3. Full verbs
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