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B: I’m not sure, but it can’t be a dog. It was bigger.
I think it might be a bear or a wolf.
1. 情态动词表推测
must（一定），may/might/could（可能），
can’t（一定不）
2. 情态动词后面接动词原形，动词原形不一定
是be，还可以是别的动词。
3. Whose… is this?
be sb.’s
It must/may/might/could/can’t
belong to sb.
4a Choose the best way to complete each
sentence using the words in brackets.
might be I’m not sure.
must be Everyone is going to the pool.
could be I wonder
can’t be He doesn’t wear glasses.
could be She was thinking of taking a shower.
4b Complete these responses.
1. A: Many people are wearing coats.
B: The weather must be ______________________________.
2. A: Sally has been coughing a lot.
B: She might be _______________________.
3. A: This restaurant is always crowded.
B: The food _______________________.
4. A: Whenever I try to read this book, I feel sleepy.
B: It can’t ___________________________.
cold
ill/having a sore throat/having a cold
must be nice/tasty/delicious