Is he in the study?怎样改为复数句?

in,study,the,writing,homework,he,is 连词成句 reading,he,the,study,is,in 怎么排列 Is he in the study?怎样改为复数句? He is looking a book in the study now.改错 They are in the study（改疑问句）He is in the kitchen.(改疑问句 He is doing his homework in the study改为一般He is doing his homework in the study改为一般疑问句,并作否定回答 the,doctor,who,the,in,is,study? He is doing his homeworkA.in his study B.on the desk He is doing his homework in the study.改成一般疑问句,并做肯定回答急 is,an,e-mail,the,study,in,he,writing连词成句 reading he the study is in请把它们连成一个句子, writing,he,an,e-mail,study,the,in,is 这几个单词连词成句 study the in he is an e- mail writing 连成一句话 Is that ()he used to study?为什么填where,而不是填in which,the place,in the place呢? Is your brouther in the study now didn't study hard.He is _____ failing the exam.He didn't study hard.He is _____ failing the exam.A.in danger B.in danger of C.dangerous He _____English and maths in his_____.A study,study B is studying,study C study,studyingD studying,studying He is writing a letter in his study. （否定）