Modal Verbs: must

Modal Verbs: must

Must with the indefinite infinitive is used in the present to express a strong obligation, necessity or deduction.   Examples: I must study for my exam. (strong obligation)  

Auxiliary Verbs: shall and will

Auxiliary Verbs: shall and will

Shall and will are both auxiliary verbs used in English grammar to indicate the future tense. However, they have slightly different meanings and uses.

Modal Verbs: to be

Modal Verbs: to be

To be can be used as a modal verb in certain situations, although it is not as common as other modal verbs like can, must, or should.

Auxiliary Verbs: to be

Auxiliary Verbs: to be

To be is used with the present participle (ing form) of the main verb to indicate an action that is currently happening.   Example: She is studying for her exam.