they aren‘t brother and sister,（ ）填反意疑问句 为什么是are there 还是are

they aren‘t brother and sister,（ ）填反意疑问句 为什么是are there 还是are 【反义疑问句】They believe that there are UFOs.是do they还是aren't the Are they sister and brother? "They are sister and brother"sister and brother为什么不用复数? Are they brother and sister中的and为什么不换成or?or不是用在疑问句和否定句吗? there are .反问句式 aren't they are these apples 的否定回答是no,they aren't还是no,these aren't. 英语疑问句是Are you student,don't you?还是Are you student,aren't you 初三英语反义疑问句They are't student,are they?和They are student,aren' tom and linda are brother and sister.they live They are his sister and brother.把his sister and brother提问 They are my parents,my sister,my brother and I.