He is at desk .与The family are at table.这2句有语病么.动词后可以直接加介词?

He is at desk .与The family are at table.这2句有语病么.动词后可以直接加介词? “A chair is at the desk. The woman at the desk is Mrs Green?对at the desk划线提问. the student is sitting at his desk 为什么用at? He is book is on the desk (改错) He spent all day at his desk.为什么不是on the desk 关于seat sitHe is seated at the desk.=He is sitting at the desk.对么?为什么一个用被动一个用主动呢?这两个词有什么区别呀 the desk is between you and he 哪里有错误? He seating himself at the desk ,his mother began to tell him a story.句子成分怎么分析?不应该是He is seating himself...吗? He is in the room.(改为复数） The eraser is under the desk.对under the desk提问 He is at table at the table. Is the desk English? sign at the first desk 英语同义句转换①There is a desk in the classroom①There is a desk in the classroom②He has a desk in the room at desk/table,at the chair/desk的区别 at the desk和 at desk的区别是 Dick is at h_____.He has a book in his hand.The book is nice.He is reading.He has a pair of gloves.He likes them.But where are they?He looks worried.He begins to look for t_______.They are not in the box.They are not on the desk.They are not in the b the chair is( )the desk.