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To know how to deduce facts.
Task 1
Study what can be used to deduce facts
推理
What can be used to make inferences?
（推测）
Mr Li has gone to Paris. He _______ be in Zhuhai.
Bob is sad.
He _________ get bad grades.
Lily didn't go to school today.
She ____________ be ill.
She is not here.
She______go out.
His name is on the book. The book _______be his.
must
must
can't
might/could
might/could
(must, can't, could, might) can be used to make inferences.
（推测）
Modal verbs
B. To show you think sth is probably true.
(you are very sure it is true)
A. To show you think sth is almost not true.
(you are very sure it is not true)
C. To show you think sth is possibly true.
(you are not sure it is true or not)
3. Allen didn't go to school today. He could be ill.
2. She has gone out. She can't be in the room.