1.i'll go with u as soon as i finish my workhe will return the book as soon as he has done with it.两句话的结构不是差不多吗,为什么第二句后面用完成时态?能否举出相关主句什么时态,从句就用什么形态类型的句

1.i'll go with u as soon as i finish my workhe will return the book as soon as he has done with it.两句话的结构不是差不多吗,为什么第二句后面用完成时态?能否举出相关主句什么时态,从句就用什么形态类型的句
1.i'll go with u as soon as i finish my work
he will return the book as soon as he has done with it.
两句话的结构不是差不多吗,为什么第二句后面用完成时态?
能否举出相关主句什么时态,从句就用什么形态类型的句子?
2.this is the very book that i want
是不是因为有very 所以用that?
如果没有very可以用which把?

1.i'll go with u as soon as i finish my workhe will return the book as soon as he has done with it.两句话的结构不是差不多吗,为什么第二句后面用完成时态?能否举出相关主句什么时态,从句就用什么形态类型的句
1.as soon as引导状语从句,从句中不用will表示将来,故will在从句中不能出现,可以在主句中出现.根据句子的意思,主从句都是表示将来含义,故主句都是将来时态；从句as soon as i finish my work是指单纯的将来,“我一完成工作就和你一起去”,而另一句as soon as he has done with it则是will have done 将来完成时的省略（will）,强调的是一定要将来完成了从句do动作以后才会发生return的主句动作.
大部分句子主从句时态还是比较一致的,比如：He always does what he likes.
2.定语从句先行词（尤表物）受very,only,序数词,最高级等修饰时,从句引导词只能用that.你记不能用that 的情况嘛,比如从句和先行词之间有逗号,从句中介词提前等,剩下的都用that一般就不会出错了.