试题题干
Rewrite the following sentences as required.
Using a non-finite clause as subject:
It is difficult to study English well within 2 years.
参考答案
试题解析
本题考查不定式的用法。非限定动词词组有：动词不定式、-ing分词、-ed分词。原句中真正的主语就是to study English well within 2 years，所以可以把不定式短语提到句首做主语。
句意：在两年内学好英语是很困难的。