Page 99 - BASIC GRAMMAR PRACTICE

Modal*

66 / have to be there at 9 o'clock: have + fo-infinitive

FORM
Present Past
I I
You You
have to
We We
They They had to do it.
do it. She
She He
He has to It
It

• The verb have + the to-infinitive.

Note: have + fo-infinitive has its own meaning and in this way it is like a modal verb.
However, it does not have the form of a modal - it is an ordinary verb and we can use it in
any tense. The form of the positive, negative and question is the same as for other verbs.

USE

• have + to-infinitive = It is very important to do something/It is necessary to
do something.
• not have + to-infinitive = It is not necessary to do something.

• have + to-infinitive is very similar in meaning to must but we can use it for
all tenses. We can say:
We must leave early, or
We have to leave early, but only
We had to leave early last night. (We do not use must in the past.)
• must and have + to-infinitive have different meanings in the negative:
You mustn't stay here. It's very dangerous.
( = It is very important that you don't stay here.)
You don't have to wait for me. I can get a taxi home.
(= It is not necessary for you to wait for me, but you can wait if you want to.)

Practice

66a Complete the sentences with have + to-infinitive in the correct form and
one of the verbs below. Use have in the present simple.

read explain shout be stop
come get up sleep talk send
open answer decide take turn

1 I .have to be.. at work at 9 o'clock in the morning, (positive)
2 We ..don't have to get up...early at weekends, (negative)
3 She all the phone calls at work, (positive)

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