They're helping Mother with the housework.（改为附加疑问句）

They're helping Mother with the housework.（改为附加疑问句）
They're helping Mother with the housework.（改为附加疑问句）

They're helping Mother with the housework.（改为附加疑问句）
They're helping Mother with the housework,aren't they
注：前肯后否.
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如下
They're helping Mother with the housework. Aren't they?
他们正在帮妈妈做家务。 不是吗？


若有疑问及时追问，满意敬请采纳，O(∩_∩)O谢谢~~