They aren't here now; they have gone to the _______(doctor). 为什么用doctor's?

They aren't here now; they have gone to the _______(doctor). 为什么用doctor's? They aren't working now.They are on ______. They must be there now,aren't they?这里为什么不是mustn't they而是aren't they? everyone is here,(aren't they)为什么用复数 填空：they -----(not,water)the flowers now.改为：they aren't waterring the flowers now.对吗? Are everyone here now?---no,Jim and Tom aren’t here哪里错了? Are everyone here now?No,Jim and Tom aren't here Is there anybody here?回答是不是Yes,they are.或No,they aren't. They aren,t there now 还有 They were there a moment ago They u_____ to be good friends,but they aren't now there were many trees here but there aren`t any now.改为同义句 There were a lot of trees here,but now there aren't any改为同意句 改错题：(3) Did Sam walked to school yesterday?(4) There aren't some boys here.(5) I want do my homeword now.(6) They're my grandparent.(7)She is learnt English now. Are these _____ tickets?No,_____ are not _____._____ aren't here.(they) 用所给代词的适当形式填空.ARE THESE( )TICKETS?NO,( )AREN'T HERE.(THEY) There is nobody here,( ).A.is there B.isn't there C.are they D.aren't they. No,they aren't是什么意思 ()()sad?No,they aren't