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Must / Have To - Mustn't / Not Have To

Must / Have To - Mustn't / Not Have To

Date: Oct 11 2007

Topic: Vocabulary

Author: ehlton

Lesson




Listed below are examples and uses of must / have to / mustn't / not have to


Examples

We have to get up early.
They will have to arrive early.
Does he have to go?

Usage
Use 'have to' in the past, present and future to express responsibility or necessity. NOTE: 'have to' is conjugated as a regular verb and therefore requires an auxillary verb in the question form or negative.




Examples


I must finish this work before I leave.
Must you work so hard?

Usage
Use 'must' to express something that you or a person feels is necessary. This form is used only in the present and future.




Examples

You don't have to arrive before 8.
They didn't have to work so hard.

Usage
The negative form of 'have to' expresses the idea that something is not required. It is however, possible if so desired.



Examples>

She mustn't use such horrible language.
Tom,you mustn't play with fire.

Usage
The negative form of 'must' expresses the idea that something is prohibited - this form is very different in meaning than the negative of 'have to'!



Examples

Did they have to leave so early?
He had to stay overnight in Dallas.

Usage
IMPORTANT: The past form of 'have to' and 'must' is 'had to'. Must does not exist in the past.



Comments

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efomario

Ethiopia

Every one must know this.

08:04 AM Nov 17 2009 |

xy997

United States

I have an example.
She is too fat ,she ___eat too much. Shall I use would’t or mustn’t?

04:10 AM Mar 29 2008 |

xy997

United States

I have an example.
She is too fat ,she ___eat too much. Shall I use would’t or mustn’t?

04:10 AM Mar 29 2008 |

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