如果要说明不定式的动作是谁作的,可以在不定式前加一个 for __ 的短语,如:
1) We are sorry to leave the seaside so soon.(不定式的主语是句子的主语 We)
2) We are sorry for you to leave the seaside so soon.(不定式的主语是由 for 引出的)
再看:
3) I have closed the window not to catch cold.
4) I have closed the window for you not to catch cold.