概要：5 . keep silent 意为“保持沉默”。例如：When the teacher questioned the students , some of whom kept silent . Don\'t keep silent when you are asked to answer the question . 6 . fall in love with ( = lose one\'s heart to ) 意为“爱上”。例如：The young man fell in love with the beautiful girl at first sight . He fell in love with her when they worked together in the country . He liked the girl but didn\'t fall in love with her . 7 . make sure of + sth . / doing sth . 意为“将……弄确切；确保……”。We
高二英语第二十二单元A Tale of Two cities,标签：高二英语选修7教案,高二英语下册教案,http://www.67jx.com5 . keep silent 意为“保持沉默”。例如：
When the teacher questioned the students , some of whom kept silent .
Don\'t keep silent when you are asked to answer the question .
6 . fall in love with ( = lose one\'s heart to ) 意为“爱上”。例如：
The young man fell in love with the beautiful girl at first sight .
He fell in love with her when they worked together in the country .
He liked the girl but didn\'t fall in love with her .
7 . make sure of + sth . / doing sth . 意为“将……弄确切；确保……”。
We should get there as early as possible in order to make sure of getting a ticket for the concert .
Will you make sure of his return?
make sure + that - clause 还可以作为一个句型掌握。如：
I haven\'t made sure that I will win the match .
Please make sure that lights are turned off .
Will you make sure that he returned?
Make sure that you pick me up at five .
8 . set fire to sth . ( = set sth . on fire ) 意为“放火烧某物；使某物着火”。例如：
The enemy set fire to the village .
( = The enemy set the village on fire . )
单元难点疑点思路明晰
1 . The guards couldn\'t have been watching very carefully . 卫兵不可能一直进行严密的监视。
〖 明晰 〗 ( 1 ) 对于现在事件的否定推断，可用 can\'t 或 couldn\'t 加上动词 be 的不定式一般式。如：
child：Can I have some sweets? I\'m hungry . 我可以吃一点糖果吗?我饿了。
Mother：You can\'t / couldn\'t be hungry . You\'ve just had dinner . 你不会饿的，你刚吃过饭。
( 2 ) 对于过去事件的否定推断，可以由 can\'t / couldn\'t + 任何动词的不定式完成式来表示。例如中“couldn\'t + have been + v . - ing”是couldn\'t + 不定式的完成进行式，表示“想必不可能一直在进行”的意思。例如：
It\'s very late now . Jack can\'t have been waiting at the bus stop .
All the lights were out . They couldn\'t have been working in the factory .
She couldn\'t have been writing . So far as I know , she has been ill since last month .
( 3 ) 在其它时态中的用法。例如：
Tom：A man answered the phone . I suppose it was her husband .
Ann：It couldn\'t have been her husband . He\'s been dead for ages .
Ann：Who brought the grand piano upstairs?
Mary：Perhaps it was Tom .
Ann：He can\'t / couldn\'t have dome it by himself .
2 . You must have been mad to speak to the servant! 你跟那个仆人讲话，准是发疯了!
〖 明晰 〗 ( 1 ) “must have + 过去分词”表示对过去情况比较肯定的推测，意为“准是”，“想必一定是”。又如：
She must have been very young when she got married .
The ground is wet . It must have rained last night .
He must have arrived by now .
Mary must have caught a cold . she had a high fever last night .
( 2 ) 对现在情况的推测，用“must + 动词不定式 ( 不带to ) ”，如：
Mary must catch a cold , she has a high fever .
This must be your room .
Comrade Li must be in the dormitory now .
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