What is this?答语是什么?如果是it is,那this is何时用?

what is this book for的答语可以是什么? What is this?答语是什么?如果是it is,那this is何时用? 英语句子答语What is this?的答语是This is还是It is Is this your father?答语是什么 what is mr.white答语是什么 Is this a picture of a drawing?的答语是什么? This is a book答语 this is what i should do这句话是什么的答语 what's this in english 的答语 what s this in Engish?写答语 what s this in Engish?写答语 电话用语：This is Tom,Is that Mary?的答语应该是什么? Is this your sister?的答语是? is this your sister的答语是 Is this your father?的答语 is this your pencil-box?的答语 What is the man doing的答语 What is his name? 答语有哪些?