典型形式主語考題分析

Is __________ necessary to complete the design before National Day?

A. this                        B. that                        C. it                        D. he

【分析】此題應選C，其余各項均有一定的干擾性。這里主要考查形式主語it的用法。一般說來，當主語是比較復雜的成分(如不定式、動名詞、從句等)時，通常在句首使用形式主語 it，而把真正的主語放在后面：

Is it necessary to tell his father everything?有必要把這一切都告訴他父親嗎?

It is wrong to say anything like that on that occasion. 在那種場合說那樣的話是錯誤的。

It’s no good sitting up too late. 熬夜沒有好處。

It’ll be wonderful lying on the beach all day. 整天躺在海灘上該是多么妙啊!

It is quite clear that he has read the book. 很顯然，他讀過這本書。

It’s a problem where we could get so much money. 我們到哪里去弄這么多錢，這是一個難題。

有時可在用作主語的不定式前加上介詞 for / of短語：

It is very kind of you to say that. 你這樣說，真是太好了。

It is important for us to keep the balance of nature. 我們要保持生態平衡，這點很重要。