Is this your an eraser?哪错了?

Is this your an English book?该错 is this your an eraser?是不是对的， Is this your second time (send) an e-mail? This is a email.You can send your friend an ( ) Is this your an eraser?哪错了? Is this an egg? this is an easy this is an Is this an eye? Is this an umbrella this is an is this your skirt this is your Maybe this is your Is this your uncle? this is your aunt. is this your business Is this your schoolbag?