is to do和doing的区别His problem is thinking too much about his personal interest.The purpose of the Youth League meeting is to set up a volunteer project.I have an important meeting to attend this afternoon.

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is to do和doing的区别
His problem is thinking too much about his personal interest.
The purpose of the Youth League meeting is to set up a volunteer project.
I have an important meeting to attend this afternoon.

is to do 要做某事,还没有做
doing 通常是正在做,或者已经完成的动作

to do是表示一种趋势,要做什么事
doing 表示一种状态,正在做什么

前者是表将来,后者是现在 进行时

is to do 是将要做,表示还没发生的事情,是将来时
doing是正在做,表示事情正在进行中,是进行时,但有时与always连用时,表示一种不耐烦,老是在做某事