Primary auxiliaries

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The primary auxiliaries are of three kinds: be, do and have. Each of them has different forms.

Be

The auxiliary be has five forms: is, am, are, was and were. Be also has a present participle (being) and a past participle (been) form.

Do

Do has three forms: do, does and did. The forms do and does are used to make questions and negative sentences in the simple present tense. Do is used with plural nouns and pronouns. Does is used with singular nouns and pronouns.

Did is used to make questions and negative sentences in the simple past tense. Note that after do, does and did, we use the infinitive without to.

Have

Have has three forms: have, has and had. Have and has are used to make the present perfect and perfect continuous tense forms. Have is used with plural nouns and pronouns. Has is used with singular nouns and pronouns.

Had is used to make the past perfect and perfect continuous tense forms.

Have is also used to talk about possession, relationships and other ideas.

See also

Pain and ache: difference
Perhaps
Play and game
Point of view
Primary auxiliaries
Prize and price
Provide or provide with
Provided that

See also

Of course
Often
Once
One
On time and in time
Otherwise
Ought to have + past participle
Overlook and look over: difference
Owing to, due to, because of and on account of

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