高考語法專題：定語從句
they remembered in the school.
c.用which不用that：指物，在介詞后或引導非限制性定語從句：
i’ll never forget the day on which i joined the army.
that was the way (in which) she looked after us.
football, which is a very interesting game, is played all over the
world.
2.非限制性定語從句
限制性定語從句是先行詞不可缺少的定語，而非限制性定語從句
只是附加說明，如果去掉，主句意思仍然清楚。非限制性定語從
句用逗號與主句隔開，由which, who, whom, whose, where, when、
等引導：
his brother, who is a pla man, wrote to him.(只有一個哥哥)
his brother who is a pla man wrote to him.(不只一個哥哥)
football, which is a very interesting game, is played all over the
world.
we’ll put off the outing until next week, when we won’t be so
busy.
he took out a piece of paper, on which were written some words.
they arrived at a farmhouse, in front of which sat a small boy.
比較：“他有兩個女兒,其中一個是護士。”
he has two daughters, one of whom works as a nurse.
(非限制性定語從句)
he has two daughters, and one of them works as a nurse.(并列句)
另外，as和which引導非限制性定語從句，可代替整個句子，as指熟知的內(nèi)容，引導的句子可在句首、句中和句尾；而which指沒想到的事情或客觀事實，且只能在句尾。比較：
as is known to all, Chinese Taiwan belongs to china.
the earth, as we know, goes around the sun.
he is against the idea, as can be expected.
he has to work on sundays, which he doesn’t like.
she remarried, as we had expected.
3.介詞+關(guān)系代詞引導的定語從句
(1)介詞+關(guān)系代詞引導的定語從句，修飾物時用which不用that,
修飾人時用whom不用who。例如：
this is the room in which we lived last year.
who’s the comrade with whom you just shook hands?
(2)注意:固定搭配,介詞不能提前。例如：
is this the book which she was looking for?
(3)既可引導限制性定語從句，也可引導非限制性定語從句。
例如：