你们正在上一节数学课吗？不。我们在上英语课。
Are you having a Maths lesson? No, we aren't. We're having an English lesson.
我们星期四没有中文课，现在我们正在上英语课。
We don't have any Chinese class on Thursday and we are having English class now.
不行，我们是在上英语课，必须用英语表达。
No, you can't. This is an English class, and you have to express yourself in English.
不行，我们是在上英语课，你必须用英语来表达。
No, you can't. This is an English class, and you have to express your self in English.
不行，我们是在上英语课，你必须用英语来表达。
No, you can't. This is an English class, and you have to express your self in English.
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