Is it a box?回答我

Is it a pencil-box?改为肯定回答. What's this?It's a box.为什么回答中要用It's,而不用this is a box I think it is a big box It is a _____ box(wood) What's in the box?__回答____ A.It's a shirt B.There is a shirt what is in the box?怎样回答 it is.和this is.回答时区别 ( )it a hamster?回答:yes,Here it is.帮我 What is this? It is a box.复数形式 It is too heavy a box fer me to carry 为什么 too heavy a box 不是 it is a box.(改为复数形式）帮忙啊! How big a box it is!改为同义句 It is a large box.(改为复数句）