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 table at the table. at the table the table 前还可家什么介词, at desk/table,at the chair/desk的区别 at the table 与at table 有什么区别 desk 前加的介词 on 与 at 的区别 at.the.entyance后加什么介词 the family members gathered at the table 系动词后可以直接加介词吗 关于seat sitHe is seated at the desk.=He is sitting at the des This house is perfect at the sea.这句话有语病么? Her family were at the dinner table waiting for him when he Sitting at the table.介词为什么用at?