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نبدأ
Verbs
Auxiliary verbs
Auxiliary verbs, sometimes called helping verbs, help complete the form and meaning of main verbs.
The auxiliary verbs include the modal verbs, the primary verbs, and a few special verbs like dare and need. The modal verbs are can, could, may, might, must, shall, should, will, and would.
They are called modal because they express the mood of verbs (for more on this, see verbs, mood of and subjunctive)
The primary verbs are be, do, and have.
The primary verbs have the distinction of being able to function either as main verbs or as auxiliaries.
The auxiliary verbs differ from main verbs in the following ways:
They do not take word endings to form participles or agree with their subject. Thus, we say She may go to the store, but never She mays go to the store.
They come before not in negative clauses, and they do not use do to form the negative: You might not like that. A main verb uses do to form the negative and follows not: You do not like that.
They come before the subject in a question: Can I have another apple? Would you like to go to the movies? Main verbs must use do and follow the subject to form questions: Do you want to go to the movies?
They take the infinitive without to: I will call you tomorrow. A main verb that takes an infinitive always uses to: I promise to call you tomorrow
"The need for auxiliary verbs
In English sentences, a lot of important meanings are expressed by the form of the verb phrase - for example questioning, negation, time, completion, continuation, repetition, willingness, possibility, obligation.
But English verbs do not have many different forms: the maximum (except for "be") is five (e.g. see, sees, seeing, saw, seen). So to express all these meanings, a number of
'auxiliary' (or 'helping') verbs are added to other verbs. There are two groups:
1) be, do and have
Be is added to other verbs to make progressive or passive forms.
Is it raining?
She
was imprisoned for three years.
Do is used to make questions, negatives and emphatic forms of non-auxiliary verbs.
Do you smoke?
It
didn't matter.
Do come in.
Have is used to make perfect forms.
What
have you done?
I realised that I
hadn't turned the lights off.
2) modal auxiliary verbs
The verbs
will, shall, would, should, can, could, may, might, must and ought are usually called 'modal auxiliary verbs'. They are used with other verbs to add various meanings, mostly to do with degrees of certainty or obligation."/]