作业帮What's this?It's a box.为什么回答中要用It's,而不用this is a box
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What's this?It's a box.为什么回答中要用It's,而不用this is a box
It is a box.是强调‘箱子’不是别的什么东东
This is a box.是强调 ‘这（this）’ 而不是‘那（that)’
都可以啊
没为什么 约定俗成
用this语法上也没错
呵呵，这是一个很简单的问题，前面句中的"this"是代词。后面用"it"回答代替了你所指的东西。建议你看看字典里关于“it”的所有解释。
这属于日常用语，没有为什么，习惯这么说。
说成This is a box.没有语法错误。
随便的，It's是this is 的缩写，一般读的时候用It's比较方便。
约定俗成
学人家的语言，就得遵守一些人家的约定
。。。这个你随便好啦。。无所谓的
老外就是那么回答的啊。
这是个语言问题，就好像中文里面，
提问“这是什么？”
回答：“是盒子”。并不一定非要回答成“这是”盒子。
都没有语法错误，但it's作为代词比this is更简洁
it是前面提到过的，两个人都心知肚明的事物．还表示脑子里想的那个抽象的．也可当成是一种惯用．
是习惯这么说
this is a box.也可以
介绍某个你近旁的人或物用This is ...的句型比较多
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