请分析句子成分(as the subject)

问题描述

We can only use whether, but not if, when the clause as the subject is at the beginning of the sentence.

请问这里的 as the subject 是作何成分？谢谢！

老师答疑

陈老师：

We can only use whether, but not if, when the clause as the subject is at the beginning of the sentence.

请问这里的 as the subject 是作何成分？谢谢！

回答如下：

(1)as the subject 为介词短语作后置定语修饰前面的名词“clause从句)

(2)as the subject 中文意思“作主语的“

(3)整个句子意思：当用作为主语的从句放在句子的句首时，我们仅仅只能使用whether,不能使用if

The dykes as a protection against the sea will be built next year.

 作为了防止海水泛滥堤坝明天将会被建造.

如果满意，请采纳，谢谢！