【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

【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