1、Unit 3重点句子讲解1. I dont think my arm is broken.在动词think, believe, expect, guess等后面的宾语从句中的谓语动词如果是否定形式，这一否定形式往往转移到主句中，也就是主句成了否定形式，而从句成了肯定形式，但实际上还是否定的从句。如：We dont believe they can keep up with us. 我相信他们是不会赶上我们的。2. I wanted to stop her from running after the ball, but she didnt hear me.句式stop from doing 意
2、为“阻止做某事”，其中的stop可用keep, prevent加以替换。如：The heavy rain stopped us from having sports meeting. 大雨阻止了我们举行运动会。3. “There is something wrong with me,” I thought.由some, any, no, every 加上thing, body, one可以构成表示人或物的不定代词。比如something, anything, nothing, everything, somebody, anybody, nobody, everything等。以这类代词作主语
3、时，谓语动词要用单数形式；并且形容词修饰这类不定代词时应该放在这些不定代词之后。如：Everything is OK. Lets begin our meeting. 一切都准备好了。咱们开会吧。Is there anything new in todays newspaper? 今天的报纸上有什么新消息吗？4. Its easy to slip and fall on a wet floor.不定式作主语时，往往用it作形式主语，而将不定式放在后面。这句话中的主语是to slip and fall on a wet floor, it是形式主语，is是系词，easy是表语。如：To hear
4、 your voice is so nice. = It is nice to hear your voice. 听到你的声音真高兴。To learn English well is very important. = It is very important to learn English well. 学好英语很重要。5. I will never try to catch the falling dinosaur.句中的falling 是现在分词作定语，意思是“正落下的”，修饰后面的名词dinosaur。过去分词也有这种用法。如：Dont wake up the sleeping boy
5、. 不要叫醒那个熟睡的孩子。The broken computer hasnt been fixed yet. 那台坏电脑还没修好呢。现在分词或过去分词短语作定语时则应该放在它们所修饰的名词之后。如：Do you know the girl singing in the room? 你认识正在房间里唱歌的那个女孩吗？The table covered with paper is red. 用纸盖着的桌子是红色的。6. I told her I would be careful.这是带有宾语从句的复合句，主句为一般过去时，从句用的是过去将来时would be careful，在这里表示过去将要做某事。如：The children said they wouldnt play football in the street. 孩子们说不会在街上踢足球了。He told me he would not go with us if it rained.他告诉我如果天下雨的话，他就不和我一起去了。
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