Modal verbs

Modal verbs

How to use Must, Have to and Should

Must and Have to

are used to express obligations

Example:

-We must talk to her before she leaves

-I have to go into work early tomorrow.

Must

-Personal obligation

Example: I must clean my house

(Necessary and important for me)

Have to

Situational obligation

Example: I have to clean my house

(my parents come to visit me)

Negatives

Must not (mustn't)

-Prohibition

Ex: You mustn't make a noise

Don't have

-Lack of obligation

Ex: You don't have to do the homework today

Must

Supposition

ex: You must be Dean.

She is not here, she must be at the gym

Rules

Ex: Dogs must be kept on a lead

Passengers must wear seatbelts

Should

to give advice or express your opinion

ex: You should go to bed earlier.

Must and should

Must can also be used to give advice

Ex: You must try the fish. It’s delicious! (stronger and more emphatic)

-You should try the fish. It’s delicious! (neutral)

Multiple Choice

I....... get up early tomorrow, I have a business meeting

• must

• have to

• should

Multiple Choice

He .....do more work if he wants to get promoted.

• must

• have to

• should

Multiple Choice

You ...... try once more—I’m sure you can get it.

• must

• have to

• should

Multiple Choice

Judging by her accent, she ..... be Spanish

• Must

• have to

• should

Multiple Choice

Students .... arrive on time for class

• must

• have to

• should