teacher's desk or teachers' desk?teacher's office or teachers' office?

teacher's desk or teachers' desk?teacher's office or teachers' office? teacher's desk还是teachers' desk 讲台的英语是teachers' desk还是 teacher's desk simon walked ( ) his desk( ) the teacher's desk 填介词 this a teacher,s deacher desk? The teacher's desk is y_____, Jim is ( ) the teacher's desk? This is s（） a.teachers'desk b.teacher desk c.tThis is s（） a.teachers'desk b.teacher desk c.teacher's desk 是where is teacher 'desk 还是where is the s teacher 's desk 为什么? on teacher's desk和on the teacher's desk有什么不同 怎样回答What's on the teacher's desk? there's a video t_____on the teacher's desk. teacher's desk和teachers' desk我们教材说的是teacher's desk,但有些练习册是teachers' desk,究竟是哪个呢?两个都可以? the book on theteacher's desk is mine=( ) ( ) the book on the teacher's desk What's on （ ）desk?A.teachers B.teacher's C.the teacher's is this a teacher,s desk?怎么作否定回答? IS this teacher`s desk?怎么改为肯定回答 Is this a teacher's desk?是神马意思?