todo和doing放句首的区别
to do放句首为动词不定式，用法和doing类似，多用来后边常说的事还没发生。doing放句首是动名词，望文生义，其等同于专有名词，例句：Doing lots of exercise is good for health.
to do和doing的区别有什么
1.固定搭配区别
有些动词的宾语必须用to do，而有些动词的宾语只能用doing,二者不能站错队。如decide, agree, ask, hope, learn, pretend等词后只能用to do，而enjoy，finish，miss，mind， excuse以及keep (on)， give up， can’t help等词（组）后只能用doing，这是英语中的固定用法。
2.意义不同
在like，begin， start， regret等动词后to do与doing意义大致相同，但在stop， forget， remember等动词后的to do与doing则完全不同了。这类动词后的doing表示正在发生或已经发生了的动作，而to do则表示尚未发生或即将发生的动作。
Class begins, please stop talking.（上课了，别讲话了）
Class is over, let’s stop to play.（下课了，我们停下来玩玩吧）
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绛旓細to do 琛ㄧず鍔ㄤ綔鐨勭洰鐨 doing 琛ㄧず鍔ㄤ綔鐨勭姸鎬侊紝鍦ㄨ繘琛 to kill them, we plan ***灏辨槸琛ㄧず鐩殑 walking in the street, she want to***灏辨槸寮鸿皟鍔ㄤ綔鐨勭姸鎬侊紝鍓嶄箣锛
