雅思形容詞性從句

定語從句在句中作定語，其作用是修飾主句的某個名詞性成分，相當於形容詞，所以又稱爲形容詞性從句。通常定語從句皆置於它所修飾的`名詞或代詞之後，被修飾的名詞或代詞叫做先行詞，而引導定語從句的詞稱爲關聯詞。

關聯詞常有3個作用：連接作用，引導定語從句;代替先行詞;在定語從句中擔當一個成分。關聯詞爲關係代詞和關係副詞。關係代詞在定語從句中可以用作主語、賓語、定語等;關係副詞在定語從句中只用作狀語。如：

One factor which may help ensure that some endangered languages do not die out completely is peoples increasing appreciation of their cultural identity.

And even in regions where new projects seem warranted, we must find ways to meet demands with fewer resources, respecting ecological criteria and to a smaller budget.

定語從句一般緊跟在其先行詞之後。如：

Food production has kept pace with soaring populations mainly because of the expansion of artificial irrigation systems that make possible the growth of 40% of the worlds food.

有時也可以與先行詞分離。如：

A new teacher will come tomorrow, who will teach you Chinese.

用作關聯詞的關係代詞有that, which, who, whom, whose, as等，但在此提醒考生們絕對沒有what。who, whom, whose指人，who是主格，在定語從句中用作主語;whom是賓格，在定語從句中用作賓語;whose是屬格，在定語從句中用作定語。如：