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Step 2
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总结which、that、who和whom引导的定语从句的用法。
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1. 当先行词为物时，引导定语从句的关系代词可用that或which ，在从句中可作主语或宾语。
2.当先行词为人时，引导定语从句的关系代词 作主语时可用that / who;作宾语时可用that / who / whom。
3.在定语从句中,关系代词作主语时不能省略；关系代词作宾语时可省略。
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Know the main use of attributive clause with which,that,
Who and whom.
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Step 3
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在定语从句中只能用that不能用which.
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1.先行词为all, everything, nothing, something, anything, little, much 等不定代词时.
2. 先行词被all, little, much, every, no 等修饰时。
3. 先行词被序数词或形容词最高级修饰时。
4. 先行词被the only, the very, the same, the last修饰时。
5. 先行词为人和物的组合。
6. 若主句中有疑问代词who或者which, 为了避免重复, 关系代词不要再用who, which，而用that。
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Know the special use of attributive clause with that.
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