a chair to sit on;a pen to write with.这种怎么判断最后要不要加介词?
问题描述：
a chair to sit on;a pen to write with.这种怎么判断最后要不要加介词?
从句中，比如说：Although the lecture had already been on for five minutes ,I still was not able to find a chair_________.
这是to sit 还是to sit on .为什么？
答
这是一种后置定语,是用动词不定式做定语,你可以把to sit on 带入前句的a chair里
sit是不及物动词,后边想加宾语要用介词连接,“sit on a chair”是固定搭配,所以要加介词on