loading? 关系代词的语法注意 1.常用that 不用which的情况: a.在there be 句型中，只用that，不用which。 b.在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。 ? I will do all (that) I can to help you. c.先行词有the only, the very.（恰恰，正好）.any. few. little. no. all 修饰时，只用that。 He was the only person that joined the army in his village that year. d.先行词为序数词、数词、形容词最高级时，只用that。 e.先行词既有人，又有物时。 They talked about the people and the things (that)they remembered in the school. f,当主句是以who 或which开头的疑问句时, 定语从句用that 引导, 以避免重复。 Who is the boy that was here just now? ? 2、不用that的情况 在引导非限定性定语从句时 ? (错句)The tree, thatis four hundred years old, is very famous here. 介词后不能用We depend on the land from which we get our food. ? 3、不能用关系代词Which 的几种情况: 上面列出的常用that 不用which的情况+下面几种情况: a.当主句是以which开头的特殊问句时，定语从句关系代词一般用that而不用which. Which of the books that had pictures was worth reading? 1
b.在强调句型\中,只用that,不用which. It is in this room that he was born twenty years ago.
c.在\句型中,关系代词要用as, 而不用which. We need such materials as (not which) can bear high temperature. d.表示\正如... 那样 \，\正象...\之意时，用as, 不用which. Mary was late again, as had been expected.
e.As 引导的定语从句可以放在主句前面，也可以放在主句后面或主句中间，而由 which引导的定语从句只能放在主句后面。
As we all know, oceans cover more than 70% of the earth.
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4. 若被修饰的名词充当从句介词宾语时介词可提前于引导词之前,此时的引导词只能用whom 或which. The pencil with which he was writing broke.
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当先行词为way时其后的定语从句用in which或 that引导,也可不用引导词。 I don’t like the way (in which/that) he talks to me.
5,关系代词不能省略情况：
a.在介词+whom与介词+which中，whom,which不能省略。 That is the headmaster with whom my father was talking just now. b.在非限制性定语从句中，作宾语的关系代词也不能省略。 The elephant is like a spear,as anybody can see.
c.在the same ...as,such...as,as...as,the same...that中，as,that即使作宾语，也不能省略
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I have bought the same bicycle as you have (bought). (指同类用as) This is the same book that I read the day before yesterday. (that指同一个)
d.当由and,but,or等连词连接两个或两个以上的定语从句修饰一个先行词时，第一个关系代词可省，但第二，第三个不可省略。
This is the book (which) I read yesterday and which I find very interesting.
used to/be used to的分别：
①used to + do：\过去常常\表示过去习惯性的动作或状态，但如今已不存在。 Mother used not to be so forgetful.
②be used to + doing： 对……已感到习惯，或\习惯于\，to是介词，后需加名词或动名词。 Scarf is used to taking a walk.(现在习惯于散步)
③used to 的用法 （否定式简写为usedn't） 过去经常，以前常常 This used to be a shabby house. （此房年久失修）
used to,would这两个词语都可以表示过去常做某事，有时可以换用。
used to do 强调过去习惯性的行为或状态，但是现在没有这种行为或状态了。因此，这个短语的内涵是今昔对比。
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