My mother was so tired that she fell asleep when watching TV

My mother was so tired that she fell asleep when watching TV
为什么when后用watching而不用watched
英语人气:967 ℃时间:2019-08-22 15:05:02
优质解答
when watching TV=when she was watching TV 她正在看电视的时候,若用watched就没有“正在”的意思了.
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