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auxiliary verbs

Auxiliary Verbs

These are helping verbs.

1. May 

May implies permission, doubt, or possibility.
Example- It may rain tonight.

2. Might

Might is the past form of may but it does not necessarily represent past time.
Often it implies more doubt than may.
Example- If the clouds are salted, the rains might come.

3. Can

Can is used to express ability.
Example-He can do this work.

4. Could

Could is the past form of can but it does not necessarily represent past time. Often it implies a more uncertain condition than can.
Example- She could refuse, but she never does.

5.Should

Should is the past form of shall. it is used in subordinate clauses after in case and sometimes after if.
Example- I shall get some money in case of a brother comes.
It is also used in past sentences with so that and in order that:
Example- He turned the stereo down very low so that he should not disturb him.


Should also be used in subordinate clauses when we are expressing the idea that something must be done or is important. The fact is that this happens after verbs like a command, order, request, insist, suggest, advise etc. & after adjectives like------- important, vital, essentail, necessary, eager, anxious, concerned etc.
Example- I am anxious that nobody should be hurt.

Should is also used in subordinate clauses in sentences where we express personal reactions to events. We express our reactions with words like----- amazing, interesting, shocked, sorry, normal, natural, it's a shame etc.
e.g. I am sorry you should think I did it on purpose.

Must is followed by the infinitive without to.
Example- I must get up at five tomorrow.

Must is used to give strong advice or orders:
Example- I really must stop drinking.

Must is used to say that we are sure about something:
Example- I am in love----- that must be nice.

Must is used after a past reporting verb.
Example- I felt there must be something wrong.


7. Should and Ought 

Should and Ought have similar meanings, but ought is followed by to. Ought to has a more objective force and is used when we are talking about laws, duties and regulations.
Example-We ought to see her tomorrow.
Should and Ought to can also be used to talk about strong probability.
Example- He has bought thirty pints of whisky----that ought to be enough.


To talk about things which did not happen, although they were supposed to, we use
Should and Ought to with the perfect infinitive:
Example- The taxi should have arrived at 8.30.

8. DO

Do is used to make question and negative forms of ordinary verbs.
Example- Do you know Rajat?

Do is used in question-tags and short answers.
Example- Does he know I am here? ------Yes, he does.

Do is used before an imperative to make the request more persuasive.
Example- Do accompany us.

Do is not used in questions which have who, what or which as their subject
Example- Who said that?
What happened?
Which one's that?

But if who, what or which is the object of the sentence, do is used
Example- Who did you see?
Which Department do you want?

Do is also used with an-------ing form when we want to talk of activity that takes a certain time or that is repeated. In this case we find derterminers like-----the, my, some, much, etc.
Example- I usually do most of my washing on Sundays.

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