The man suddely stopped as if to see whether he was followed.

The man suddely stopped as if to see whether he was followed.这是as if从句的省略.=The man（主）suddenly stopped(谓,不及物动词,没有宾语）as if he saw whether he was followed.这个人突然停下来好象要看一...从句中不定式作什么成分？谢谢as if 还可用于省略句中，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。应该是这样的as if (he was going) to see的省略，to see应该属于谓语中的一部分。