在湖北专升本备考中，英语往往是很多基础薄弱考生的难点。但是只要掌握科学有效的方法，突破英语难关并非遥不可及。学习语法并非只能依靠死记硬背，而是可以通过更加生动有趣的方式来掌握。

3)修饰时间、地点、原因的定语从句

修饰时间的用 when，相当于相当于“介词+ which”，在句中做状语。

修饰地点的用 where，相当于相当于“介词+ which”，在句中做状语。

修饰原因的一般情况下跟的都是reason,用why 关联词引导定语从句。

He came last night when l was going to bed.

Iknow of a place where we can have lunch.

She's going home where she can rest

4)非限定性定语从句:非限定性定语从句中不能用关联词 that.

修饰人时用 who, whose,whom;修饰物时用 which,whose;修饰地点和时间的名词，且作状语时分别用where,when.如:

Water, which is a clear liquid, has many uses.

Our guide, who is a Chinese, is an excellent cook.

They will fly to Boston, where they can plan to stay for fourdays, and then go to New York.

He is our English teacher,whose wife is a manager in a big firm.

非限定性定语从句还可以修饰整个句子，关联词只能用 which.

The activity was postponed,which was exactly what wewanted.

They have invited me to attend the party, which is very kind of them.

限定型定语从句，如果修饰物并做宾语，前面又有介词，只能用-which.-但是如果定语从句修饰的是不定代词，或是-only,--very-以及形容词最高级,只能用 that.在非限定性定语从句中修饰物只能用 which,修饰人只能用 who.如果非限定性定语从句修饰整个句子，关联词只能用 which。as 也可以引导定语从句，多和 such连用。

如:Boy as he was, he was chosen king.

He was in such a fury as l have never seen.

Let's discuss only such questions as concern each of us

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