非谓语中 不定时的复合结构和动名词的复合结构是什么意思啊?

不定式复合结构就是不定式短语.如：He had no chance to go to school before libration.
They hurried to the station ,only to be told that the train had left .
动名词的复合结构就是在动名词前加上形容词性物主代词或名词所有格.如：Tom's failing the examination .his not being allowed to see his mother .