Modal Verbs for Speculation and Deduction

After the modal verbs of speculation and deduction in the present, we use an infinitive _______ to

• with

• without

We use __________when we are 90% sure that something is not true.

• may not

• can´t

• couldn´t

In the present, we use may (not), might (not) and could when there is a __________possibility that something is true or not ture.

• 20%

• 90%

• 50%

• 100%

We use ________when we are 90% sure that something is true.

• may

• might

• must

Choose the most appropriate answer.

The passengers .......... scared!

• must have been

• can't have been

• might have been

• couldn't have been

She ...... a lot to get there! You need to work hard to be successful.

• couldn't have struggle

• must have struggled

• must has struggled

• may have struggle

Of course John isn't here today. He spent the whole night dancing. He ___ be at home with a serious foot ache.

• can't

• must

• may

• should

You ___ possibly be tired. You've just woken up.

• can't

• could

• must

• should

Your mother ___ be a great cook. You are always so keen to get back home to eat!

• can't

• might

• must

• can

I don't know why I am so tired these days. I ___ be working too hard. Or maybe I am not sleeping too well.

• can't

• might

• must

• may