他是研究火山方面的专家，所以我想他可能在给你们上课。
He is a volcano expert, so I thought he might be teaching your class.
我现在在这里，今天在给你们上课。
我就是上周给你们上课的那个人。
I'm the very same person that was here lecturing to you last week.
这是我最后一次给你们上课了。
明天有个新老师给你们上课。
毫无疑问下个星期二，有人会给你们上课。
Somebody is going to be here no doubt lecturing to you next week, next Tuesday.
你们的英语老师病了，因此我替他来给你们上课。
Your English teacher is ill, so I take his place to give you lessons.
现在给你们讲课的这个人，是上周给你们上课的，那个人吗？
Is the person who is lecturing to you now the same person as the person?
现在给你们讲课的这个人，是上周给你们上课的，那个人吗？
Is the person who is lecturing to you now the same person as the person?
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