when sb. do sth.和when sb. doing sth. when do sth. 和when doing sth.区别和用法务必简单明了.

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whensb.dosth.和whensb.doingsth.whendosth.和whendoingsth.区别和用法务必简单明了.whensb.dosth.和whensb.doingsth.when

when sb. do sth.和when sb. doing sth. when do sth. 和when doing sth.区别和用法务必简单明了.
when sb. do sth.和when sb. doing sth. when do sth. 和when doing sth.区别和用法
务必简单明了.

when sb. do sth.和when sb. doing sth. when do sth. 和when doing sth.区别和用法务必简单明了.
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