They're helping Mother with the housework.怎么改为附加疑问句

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They''rehelpingMotherwiththehousework.怎么改为附加疑问句They''rehelpingMotherwiththehousework.怎么改为附加疑问句They''reh

They're helping Mother with the housework.怎么改为附加疑问句
They're helping Mother with the housework.怎么改为附加疑问句

They're helping Mother with the housework.怎么改为附加疑问句
They're helping Mother with the housework,aren’t they?

aren't they?