Page 100 - More_3_2nd_edition_Student_39_s_book_Neat

Grammar

Making deductions

1 Complete the examples with one word. Then check with the emails on page 94.

1
My skin is terrible. My mum says it ................ be an allergy.
Was it cheddar cheese? I ................ be allergic to cheese.
2
3
I think we only drank water. I ................ be allergic to water!
When you are trying to guess about something (make a deduction), and you are sure
something is true, use must. (My mum is sure that it is an allergy.)
When you are not 100% sure, use might. (It’s possible that I’m allergic to cheese, but I’m not
sure.)
When you are sure something is not true, use can’t. (I’m sure that I am not allergic to
water.).

2 Complete the sentences with must, might or can’t.

1 He eats burgers every weekend. He ........................... love burgers.
2 It’s very cold. It ........................... snow tomorrow.
3 She didn’t finish her lunch. She ........................... be ill.
4 He worked until 2 am. He ........................... be very tired.
5 That ........................... be her grandmother – she only looks about 30.
6 She ........................... be at home! I saw her in town five minutes ago.

3 Write deductions about the situations below. Use must be or can’t be.

1 cold 2 having a nice time 3 hungry

4 enjoying herself 5 watching a funny film 6 know a lot about
computers

98 UNIT 10