四、含有非謂語動詞的句子

非謂語動詞包括：動詞不定式、動名詞、現(xiàn)在分詞和過去分語。使用非謂語動詞可以用較少的詞表達同等甚至更加豐富的信息，使句子結(jié)構(gòu)緊湊、邏輯嚴謹。

如：
原句：It must be realized that people should be cautious when they decide which books they should choose to read since if they read bad books , it will be time-wasting and harmful .
優(yōu)化：It must be realized that people should be cautious when deciding which books to read since reading bad books in time-wasting and harmful .
原句：Because one of my parents is laid off , my family can't possibly afford all my expenses at college .
優(yōu)化：With one of my parents being laid off , my family can't possibly afford all my expenses at college .