my pen is in pencil case 哪里错了?

My pen is in pencil case.哪里错了? my pen is in pencil case 哪里错了? My pen is in my pencil case.(对in my pencil case提问) My pen is in my pencil case.(改为一般疑问句) There is a pen in my pencil case改为I () a pen in my pencil ca My pen is in pencil case.中有处错误请改正 My pen is in the pencil case改为一般疑问句? that is my a pencil case 哪里错了 this is his pen.my is in the pencil box 哪里错了 怎么改 My eraser am in the pencil case.哪里错? There is not a pen in my pencil-case.和 I'll show you picture It"s my pencil case.What"s in it?Look,this is a pen.