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MAY AND MIGHT MAY: 1)     May is used to express permission: Example: You may go now. 2)     It is used to express possibility: ...

English Grammar - Correct Use of Auxiliary Verbs

1)   May is used to express permission:
Example: You may go now.
2)   It is used to express possibility:
Example: she may be at home.
3)   It is used to express a wish:
Example: May you live long.
4)   It is used to express a purpose:
Example: They died that we may live.
5)   It is used to express a polite question:
Example: May I know where are you going?
6)   It is used to express concession:
7)   It is used to express possible result:

Might is used to express
1)        As the past tense of may:
Example: He might come.
2)       To express more doubtful possibility:
Example: Devi might not be in Hyderabad.
3)       To ask more polite questions:
Example: Might I borrow your car?
4)       To express gentle reproach:
1)   Ought to denote a normal necessity of morality. It can be used as a present, past or future tense and followed by the to- infinitive.
Example: You ought to respect your teacher.
2)   Ought not to have is used to express disapproval of something that was done in the past.
3)   It is used to express obligation.
Example: You ought to help the poor.
4)   It is used to express softened command or advice.

1)   Must is used to express necessity, obligation or certainty both in the present and the future time.
Example: you must run fast to catch the train.
2)   It has no past tense but it is used for a past time in reported speech.
Example: She said that they must do as they were told.
3)   Must not express negative obligation in the present or future.
Example: You must not do it.

1)   The auxiliary verb be is used in the formation of continuous tenses.
Example: She is cooking food.
I am reading a novel.
2)   It is used in the formation of passive voice.
Example: Milk is sold here.
3)   Be in the present and past tenses with the infinitive denote:
a)    An agreement
b)    Destiny
c)    Possibility
d)    The wish and command of a third person.

1)   Have is used in the formation of tenses.
Example: Sravanthi has watered plants.
2)    It showing possession.
Example: I have a nice car.
3)   Have is used with the infinitive to indicate obligation.
Example: she has to marry him.

1)   Do is used to  form the negative and interrogative of the present simple and past simple tenses of ordinary verbs
2)   It is used to avoid the repetition of previous ordinary verbs
3)   It is used to show emphasis:
4)   It is used to form the negative imperative:
5)   It is used in additions and in short disagreements:
6)   It is used in the imperative, do makes a request or invitation more persuasive

1)   Need is used in the interrogative and negative:
Example: He need not come.
Need is used for all persons in the present and future tenses.
2)   Needn’t is followed by the perfect infinitive means that something has been done, but it was unnecessary.

To dare means ‘to have the courage’ or ‘to be brave enough’
Example: She dare not disobey me.
Dare he goes there alone?

It is anomalous and it indicates habitual action in the distant past. It has only one form ‘used’
Example: I used to play cricket in my school days.
I used to go for a walk.