AllIcoulddowastowait.为什么是towait而不是waiting啊?

Question

All I could do was to wait.为什么是to wait而不是waiting啊?

Answer 1

不定式作表语喔~一般情况为主语是不定式（表示条件）,表词也是不定式（表示结果）：To see is to believe.To work means to earn a living.另一种情况为主语是aim,duty,hope,idea,job,plan,problem,purpose,thing,wish等名词为中心的短语,或以what引导的名词性从句,不定式表语对主语起补充说明作用：His aim is to study abroad in the near future.The most important thing is to negotiate with them about the price.What I want to say is to forget all the unhappy experience.