变形金刚难以置信29:改错 They begin theri class at forty past seven every day

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They begin their class at seven forty everyday.

They begin their class at seven past forty every day

their

theri--their
forty past seven--seven forty /twenty to eight

forty past seven 改为tenty to eight

They begin their classes at forty past seven every day.
class用复数。因为他们的课不可能每天只有一节。