LESSON
Modal verbs. Logical assumptions
7 hours ago by
12 slides

Modal verbs. Logical assumptions

Stefania Manea, Colegiul National "Mihai Eminescu", Petrosani, Hunedoara

Title

Today's lesson will focus on using modal verbs for logical assumption.

To express positive logical assumptions, we use: MUST = I’m sure/ certain that sth. is true;

e.g. It’s Sunday. He must be at home. (= I’m sure he’s at home.)

To express negative logical assumptions, we use CAN’T/ COULDN’T (= I’m sure/ certain that sth. isn’t true)

e.g. It’s Sunday. He can’t/ couldn’t be at work. (= I’m sure he’s not at work.)

Present logical assumptions

  • MUST + PRESENT SIMPLE INFINITIVE

                PRESENT CONTINUOUS INFINITIVE

  • CAN’T/ COULDN’T + PRESENT SIMPLE INFINITIVE

                                      PRESENT CONTINUOUS INFINITIVE

Past logical assumptions

  • MUST + PERFECT SIMPLE INFINITIVE

                 PERFECT CONTINUOUS INFINITIVE

  • CAN’T/ COULDN’T + PERFECT SIMPLE INFINITIVE

                                       PERFECT CONTINUOUS INFINITIVE

PRACTICE

Subtitle
Q.

I'm sure he has given up smoking. HAVE

answer choices

He must give up smoking

He must have given up smoking.

He must have give up smoking.

Q.

I'm sure he isn't feeling sick now. BE

answer choices

He can't feel sick now.

He can't be feeling sick now.

He mustn't be feeling sick now.

Q.

I'm sure she called the police. HAVE

answer choices

She must call the police.

She must have called the police.

She must have to call the police.

Q.

I'm sure he hadn't prepared his speech. HAVE

answer choices

He couldn't have prepared his speech.

He can't prepare his speech.

He can't had prepared his speech.

Q.

I'm certain it has stopped snowing now. HAVE

answer choices

It must has stopped snowing now.

It must have stopped snowing now.

It must stop snowing now.

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