Whose knife is on the floor?Please pick it up."whose"换成"Who's"行吗"pick it up"换成"pick up it"行吗?为什么？

Whose knife is this?(改成复数) Whose knife is on the floor?Please pick it up.whose换成Who's行吗pick it up换成pick up it行吗?为什么？ whose knife is this?将句子变成复数 There is a knife on the table.划线部分提问划a knife There is a knife on the desk.改复数句 There is a knife on the table 复数形式 The knife is on the right是哪国餐桌文化 The knife on the table is used for___(cut) wood whose turn is it ( ) on duty today [what who whose]is on duty? Whose is the bag on the desk? (1/2)A knife and fork 【 is】 on the desk为什么用is而A knife and a fo liveing on a knife The fork is on the left.The knife is on the right. (teacher) Day is on September 10th AP物理suppose we are asked to find volume of a solid whose base is the circlesuppose we are asked to find volume of a solid whose base is the circle x^2+y^2=4,and where cross-sections perpendicular to the x-axis are all square whose sides lie on th the knife on the table is mine 中对on the table提问用什么代词 whose is the book on the chair?和whose book is this?的区别