HOW TO USE THE MODAL AUXILIARY VERBS

HOW TO USE THE MODAL AUXILIARY VERBS

Definition: A verb (such as can, could, shall, should, ought to, will, or would) that is usually used with another verb to express ideas such as possibility, necessity, and permission. They also add their own meanings.

Here's a list of the modal verbs in English:

can	could	may	might	will
would	must	shall	should	ought to

Modals are different from normal verbs:
1: They don't use an “s” for the third person singular.
2: They make questions by inversion (“she can go” becomes “can she go?”).
3: They are followed directly by the infinitive of another verb (without “to”).

A: Probability:

First, they can be used when we want to say how sure we are that something happened / is happening / will happen. We often call these “modals of deduction” or “speculation” or “certainty” or “probability”.
For example:

It's snowing, so it must be very cold outside.

I don't know where John is. He could have missed the train.

This bill can't be right. £200 for two cups of coffee!

B: Ability:

We use “can” and “could” to talk about a skill or ability.
For example:

She can speak six languages.

My grandfather could play golf very well.

I can't drive.

C: Obligation and Advice:

We can use verbs such as “must” or “should” to say when something is necessary or unnecessary, or to give advice.
For example:

Children must do their homework.

We have to wear a uniform at work.

You should stop smoking.

D: Permission:

We can use verbs such as “can”, “could” and “may” to ask for and give permission. We also use modal verbs to say something is not allowed.
For example:

Could I leave early today, please?

You may not use the car tonight.

Can we swim in the lake?

E: Habits:

We can use 'will' and 'would' to talk about habits or things we usually do, or did in the past.
For example:

When I lived in Italy, we would often eat in the restaurant next to my flat.

John will always be late!

F: Past modals:

The past modals “could have + past participle: “should have + past participle” and “would have + past participle” can be confusing. 

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