this is hen还是this is a hen说这是什么东西的时候用不用加a/an this is horse还是this is ahorse

this is hen还是this is a hen说这是什么东西的时候用不用加a/an this is horse还是this is ahorse This is is this This is THIS IS this is this is 是This eraser is mine还是This eraser is my? this is for you 还是this is to you Why is this crazy?还是 why this is crazy? 是is this schoolbag your还是is this schoolbag yours What is this?是用this isF还是this is a F还是it is F this is a weekly magazine还是this is weekly magazinethis is a weekly magazine还是this is weekly magazine this book is sold well 还是this book sells well what does this mean?还是what is this mean? life like this对还是life is like this 为什么? these(this)后面接着is还是are? This book is ( )? 填Your还是Yours?