Complete the sentences with the past participle of the underlined words.

1. This essay is very long. I'm sure you took days to write it.

You must have taken days to write it.

2. He hasn't called me. Perhaps he lost my number.

He might have lost my number.

3. Their car is here. I'm sure they haven't gone out.

They can't have gone out.

Lesson 10: They must have forgotten

Making deductions تكوين استنتاجات

تكوين استنتاجات عن الماضي، نحن نستخدم

تكوين استنتاجات مع (must have, can't have, might have + P.P) لتكوين استنتاجات عن الماضي.

استخدم (must have) عندما تكون متأكدا تقريبا أن شيء ما حدث.

استخدم (might have) عندما تعتقد أنه ربما شيء ما حدث، مثل:

Where's my jacket

استخدم (can't have) عندما تكون متأكد أن شيء ما لم يحدث.

He can't have borrowed my jacket, it's too much small for him

A. Read the conversations on Student's Book page 28 again and answer the questions.

1. Why is Ammar ringing Mrs Crosby?

Because Rob is late for the football match/ He is trying to find Rob.

2. Where have Dave and Rob gone?

They've gone fishing.

3. How late are they?

They have fifteen minutes late.

4. What is surprising about Dave's behavior?

He always has his mobile with him but he hasn't phoned Ammar.

B. Complete the sentences with the past participle of the underlined words.

1. This essay is very long. I'm sure you took days to write it.

You must have taken days to write it.

2. He hasn't called me. Perhaps he lost my number.

He might have lost my number.

3. Their car is here. I'm sure they haven't gone out.

They can't have gone out.

Complete the sentences with must have, might have or can't have and the past participles of the verbs in brackets.

1. Someone phoned while you were out. I'm not sure, but it might have been (be) someone from your office.

2. Somebody has stolen my pearls. The front door is still locked, so the thief must have come (come) through the open window.

3. "I saw all the tourist attractions when I went America".

You can't have seen (see) everything. You were only there for a week.

4. "Where's my letter from Janet?"

"I'm not sure, but I might have thrown (throw) it away by mistake".