祈使句结构
  祈使句用以表达命令,要求,请求,劝告等。
1)祈使句有两种类型,一种是以动词原形开头,在动词原形之前加do (但只限于省略第二人称主语的句子)。例如:
    Take this seat. 坐这儿。
    Do be careful. 务必小心。
  否定结构:例如:
    Don\'t move. 不准动。
    Don\'t be late. 不要迟到。
2)第二种祈使句以let开头。
  Let 的反意疑问句:
  a. Let\'s 包括说话者。例如: 
  Let\'s have another try, shall we / shan\'t we? = Shall we have another try? 我们再试一次,如何?
  sort of club  b. Let us 不包括说话者。例如:
  Let us have another trywill you / won\'t you? = Will you please let us have another try? 你让我们再试一次,好吗?
  否定结构:例如:
  Let\'s not talk of that matter. 不要谈这件事。
  Let us not talk of that matter. 你不要让我们谈这件事。
13.2 感叹句结构
  感叹句通常有what, how引导,表示赞美、惊叹、喜悦、等感情。what修饰名词,how 修饰形容词,副词或动词,感叹句结构主要有以下几种:
  掌握它的搭配,即掌握了感叹句的重点。
How +形容词+ a +名词+ 陈述语序。例如:How clever a boy he is! 他是多聪明的孩子!
How+形容词或副词+陈述语序。例如:How lovely the baby is! 小毛头真可爱!
What +名词+陈述语序。例如:What noise they are making! 他们真吵!
What +a+形容词+名词+陈述语序。例如:What a clever boy he is! 他是多聪明的孩子!
What+ 形容词+复数名词+陈述语序。例如:What wonderful ideas we have! 我们的主意真棒!
What+ 形容词+不可数名词+陈述语序。例如:What cold weather it is! 多冷的天!
What a clever boy he is!的省略形式为:What a clever boy!
典型例题
1___ food you\'ve cooked!
A. How a nice  B. What a nice  C. How nice  D. What nice
  答案D. 由于How 修饰形容词,副词;what修饰名词。且food为不可数名词,因此AB 排除。C How + adj. 后面不能再加名词,因此只有D正确,其句型为What + adj. +n. (不可数)。
2___terrible weather we\'ve been having these days! 
A. What  B. What a  C. How  D. How a 
  答案A. weather为不可数名词,BD排除。Chow + adj. 后面不应有名词。只有A,符合句型What +形容词+不可数名词。
3 --- _____ I had!
  --- You really suffered a lot.
A. What a time  B. What time  C. How a time  D. how time
  答案A. 感叹句分两类:
     1What + n.+主谓部分
     2How + adj. / adv. / v.+主谓部分。本题属第一种,但省略了bad,相对于 What a bad time I had! 这是个习惯用语。
13.3 强调句结构
常用的强调句结构是it 引导的句子,结构为It iswas+ 被强调部分+ that who + 句子的其余部分。此结构强调的成分限于主语,宾语和状语。例如:
  It is from the sun that we get light and heat. 我们是从太阳那儿获取光和热。
  It was not until I had read your letter that I understood the true state of affairs. 知道读了你的信,我才知道实际情形。
典型例题
1It was last night ___ I see the comet.
A. the time B. when  C. that  D. which
  答案C. 强调句的结构是: It +be +强调部分 + that who))+ 主谓句。 强调句的连词只有两个,thatwho。当强调的部分是人,且为句子的主语时,才用 \"who\",其余用that
再如:原句:My father did the experiment in the lab yesterday evening.
    强调主语: It was my father who did the experiment in the lab yesterday evening.
  强调宾语: It was the experiment that my father did in the lab yesterday evening.
  强调时间: It was yesterday evening that my father did the experiment in the lab. (注意不用when
  强调地点: It was in the lab that my father did the experiment yesterday evening.
2It is ten years ___ Miss Green returned to Canada.
A. that B. when  C. since  D. as
  答案C. 考点是连词用法。本题易误选为A. that. 其实本句不是强调句。若是,去掉It be… that还应是一个完整的句子。而本句去掉 \'It is…that\',只剩下ten years Miss Green returned to Canada. 不成句。因此本句不是强调句。

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