when sb.do sth 是说当某人做某事,也就是时常做的,请看Does
when doing sth 是说某人正在做某事,不一定是习惯做的.强调“正在”,请看Doing
那给你举例子好了.
She usually open the door when she watchs TV
She opened the door when she watching TV
when sb. do sth.和when sb. doing sth. when do sth. 和when doin
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