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助動詞包括：be (is, am, are, was, were, been, being);
have (has, had, having);
do (does, did);shall (should), will (would)
" be + 動詞不定式"可以表示下面幾種意思:
1.命令或指示。例如：
No one is to enter the room without permission.
2.計劃或安排。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.應該。例如：
Such people are to be criticized.
5.表示後來發生的事，可以用來表示一種命運。例如：
They said good-bye, little knowing that they were never to meet again.
Task:這一期你的`任務一:仔細觀察下面三個句子,指出各個句子中的"be+動詞不定式"是上面五種意義的那一種。
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.
任務二:根據我給出的單詞填空.
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
