A 篇章学习:朗读对话，回答问题
Jimmy: Hello, Betty! Did you know there will be a sports meeting in our school next Thursday?
Betty: Really? Sounds great. Will you take part in any matches?
Jimmy: Yes, I will join in the men's 1000-meter race, and I hope I can win.
Betty: If you practice hard these days, you will win.
Jimmy: Yes, I think so. I will keep practicing unless the weather is really bad.
Betty: Good for you!
条件状语从句是在复合句中做条件状语的分句，最常用的关联词是if, 意思为“如果······”, “假如······”。
if条件句常用时态：
小贴士
if条件状语从句可以放在句末，也可以放在句首。当放在句首时， 后面常用逗号隔开。
例如：
If you don't hurry, we will miss the train.
She will drink tea with her friends in the garden if it doesn't rain.
练习1 请在横线上填上正确的动词形式。
1 If I _______________ (win) a lot of money in this game, I _______________(buy) a big house in the country.
2 She _______________ (get) a better score if she _______________ (study)much harder.
C 语法聚焦2: unless 的用法
unless引导的条件状语从句表示“除非······”“如果不······”。
unless状语从句常用时态：
主句用一般将来时，unless引导的条件状语从句常用一般现在时。
小贴士
unless也可以放在句首，后面主句用逗号隔开，可以理解为“除非······，否则······”。例如：
Unless she practices spoken English every day, she won't improve it.
除非她每天练习英语口语，否则她的英语口语不会提高。
练习2 用unless将下列各题中的两个句子改写成一个句子。
例: Amy doesn't take part in the running race. / She has time.Amy won't take part in the running race unless she has time.
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1 Tom doesn't buy a new car. / He wins the lottery.
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2 Lucy doesn't join the party. / She is invited.
_______________________________________________________________(www.xing528.com)
3 He doesn't play the violin well. / He practices hard.
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4 We go fishing tomorrow. / The weather is too bad.
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5 They have a picnic this Sunday. / It rains.
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练习3 请用所给动词的正确形式填空。
D 语法聚焦3: unless与if … not的互换
"if . . . not . . . "表示“如果不······，······将······”。
if . . . not . . . 与unless有时可以互换。
小贴士
如果unless引导的条件状语从句是否定句，那么 unless就不可以与if …not … 互换使用，否则意思正好相反。
例如: He will win the game unless he doesn't try his best.
他将赢得这场比赛，除非他没有尽全力。
≠ If he doesn't try his best, he will win the game.
练习4 改写下列句子, 将句子中unless替换为if . . . not . . .或将if . . . not . . . 替换为unless。
1 He will miss the train unless his mother wakes him up on time.
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2 They will go to the zoo if it doesn't snow next week.
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单元练习
练习5 单项选择。
1 ( ) The cat will run away ________ you give it something to eat.
A. unless B. before C. if
2 ( ) Would you mind ________ I sit here?
A. when B. if C. but
3 ( ) You will have a chance ________ you give up easily.
A. because B. until C. unless
4 ( ) ________ he doesn't have a meeting, he will be sure to come.
A. And B. Though C. If
5 ( ) She will not cook dinner_________ her mother is out.
A. unless B. when C. but
练习6 选择合适的词填空。
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