... in the middle of doing sth.正在做某事 It's high time是...的时候了 on one's own time自己的时间;非工作时间 ...
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看见某人正在做某事 see sb doing sth ; watch sb doing sth ; see sb. doing ; watch sb. doing sth
听到某人正在做某事 hear sb doing sth
假装正在做某事 pretend to be doing sth
听见某人正在做某事 hear sb. doing sth
某地有某人正在做某事 there be sb/sth doing sth +sp ; Somewhere someone is doing something
观察某人正在做某事 observe sb. doing sth ; watch sb. doing sth ; watch sb doing sth
正在做某事时 in the act of doing ; be doing sth when
看到某人正在做某事 see sb doing sth ; See someone is doing something ; catch sb doing sth
去年获胜的美国数学奥林匹克代表队的总教练罗博深说：“挑战在于，如果某些类型的人正在做某事，其他人就很难成功打入其中。”
"The challenge is if certain types of people are doing something, it's difficult for other people to break into it," said Po-Shen Loh, the head coach of last year's winning U.S. Math Olympiad team.
表示某地有某人正在做某事。
当我经过他的房门时，我听到他正在做某事。
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