做主语:真正的主语动词不定式短语做主语时,常用it作形式主语,而把(不定式短语)后置
作表语:Her job is to teach English.
作宾语:Frank hopes to travel round the world.弗兰克梦想环游世界
作定语:I have a meeting to attend.我有一个会议要出席。
做状语:She sold her hair to buy the watch chain.他卖掉了自己的头发买那条表链
作补语:I wish you to be happy.我希望你幸福。
作同位语:Soon came the order to stare the general attack.很快下达了发起总攻的命令。