这些英语句子中哪里错了???急急急！！

Is your friends Chisese?

Is this your pencil sharpener? Yes ,it's.

That's a your pen

第一句因为“friends”是复数形式，所以应该用“are”，也就是应该为：“Are your friends Chisese?”或者“Is your friend Chinese?”

第二句因为回答中是“Yes,it is.”..当“it is”在结尾时不可省略，也就是应该为：“Is this your pencil sharpener? Yes ,it is.”

第三句应该改为“That's a pen.”或者“That's your pen.”..

希望可以帮到你~