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助动词包括：be (is, am, are, was, were, been, being);
have (has, had, having);
do (does, did);shall (should), will (would)
" be + 动词不定式"可以表示下面几种意思:
1.命令或指示。例如：
No one is to enter the room without permission.
2.计划或安排。例如：
A new bridge is to be built over the river soon.
3.可能。例如：
This kind of tree is to be found in that forest.
4.应该。例如：
Such people are to be criticized.
5.表示后来发生的事，可以用来表示一种命运。例如：
They said good-bye, little knowing that they were never to meet again.
Task:这一期你的`任务一:仔细观察下面三个句子,指出各个句子中的"be+动词不定式"是上面五种意义的那一种。
books are not to be taken out of the reading-room.
expedition is to start in a week's time.
was to regret the decision.
任务二:根据我给出的单词填空.
He ____the meeting, but he fell ill.(用attend填空)
1. Mike, you__1__play with fire. You__1__ burn yourself.
A. won’t; can’t B. mustn’t; may C. don’t have to; must D. have got to; shouldn’t
2. You__2__see the doctor, Joe. You don’t look very well.
A. must B. shall C. may D. can
3. —Must I clean the window now?
—No, you__3__
A. mustn’t B. needn’t C. can’t D. may not
4. Jack’s ill, so they__4__change their plans.
A. must B. should C. have got to D. ought to
5. Harry has been reading all day —he__5__be tired.
A. should B. has got to C. has to D. must
答案：
1-5 BABCD
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