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1:定语从句什么时候用which

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1:定语从句什么时候用which
2:so that 和so as 得区别
1:定语从句什么时候用which
1、定语从句用which情况:
1,非限定性定语从句
2.关系代词前有介词
3.关系代词后有插入语
如:
1、The sun heats the earth ,which makes it possible for plants to grow .
2、The bodies on which the forces act are in equilibrium.
3、Here is the English grammar book which,as I have told you will help improve your English.
2:如果第二个问题问的这两个短语还是与定语从句有关的话,那
so后面都加形容词,that后面加句子,as后面加名词.如:The biscuits are so delicious that I want to eat more.The food is not so good as those we ate in Bill's home.
so...as用于否定句,和as...as意思一样.后者肯定句否定句都能用.
希望能帮到您!