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.
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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