They have already bought some T-shirts.(改为反义疑问句)They have already bought some T-shirts,__________ __________?答案是haven't they,求原因!

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They have already bought some T-shirts.(改为反义疑问句)They have already bought some T-shirts,__________ __________?答案是haven't they,求原因!

They have already bought some T-shirts.(改为反义疑问句)They have already bought some T-shirts,__________ __________?答案是haven't they,求原因!
They have already bought some T-shirts.(改为反义疑问句)
They have already bought some T-shirts,__________ __________?
答案是haven't they,求原因!

They have already bought some T-shirts.(改为反义疑问句)They have already bought some T-shirts,__________ __________?答案是haven't they,求原因!
因为陈述部分是现在完成时,助动词是have,并且是肯定,所以,疑问部分用否定,主语是they,所以是haven't they

前肯后否,前否后肯。
此处强调动作的完成(一般没有明确的过去时间状语),问句要用“haven't/hasn't+主语?”。
 ***(其他情况句中有have等时,问句应用don't等 )