He should be having class now.
他现在应该是在上课。
Having been caught doing other things in your class, I know any excuse may be meaningless.
被发现在您的课堂上做其他事情,我知道找借口是没有意义的。
Excuse me, I'm supposed to be having my physics class in the science building, but no one's in the classroom.
打扰一下,我现在应该在科学楼上物理课,但是教室里一个人也没有。
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