is this your rulerAyes,it's Byes,this is Cno,it isn's Dno,it is

问题描述:

is this your ruler
Ayes,it's Byes,this is Cno,it isn's Dno,it is

Is this your ruler?C,No,it isnit.
肯定回答时,it is不能缩写,也不能写成this is或that is.