【反义疑问句】They believe that there are UFOs.是do they还是aren't there说明理由

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【反义疑问句】They believe that there are UFOs.是do they还是aren't there说明理由
【反义疑问句】They believe that there are UFOs.是do they还是aren't there
说明理由

【反义疑问句】They believe that there are UFOs.是do they还是aren't there说明理由
do_not_they

do they/

do they

要么是 don't they? 是对主语的反义疑问:难道他们不相信吗?
要么是 aren't there? 是对从句中there be 结构的反义疑问:难道没有吗?

对于表达观点的句子
主句主语是第三,第二人称,对主句提问;主句主语是第一人称,对从句提问。
但根据我们老师的说法,关键看你要强调什么,其实都可以的

do they,
这是一个宾语从句,应对主句反问,believe是动词,一般现在时,因此用do +主语they进行反问

They believe that there are UFOs, don't they?

don't they