it's no good...thre is no need...为什么?那些词用it's...哪些用there is ...

it's no good...thre is no need...为什么?那些词用it's...哪些用there is ...
it's no good...thre is no need...
为什么?那些词用it's...哪些用there is ...

it's no good...thre is no need...为什么?那些词用it's...哪些用there is ...
it's 是"主系表"结构,是说一个东西怎么怎么样,例如,好/坏,大小,颜色...等等
比如: it's not bad.
there is 表示"有"
比如: there is a cup on the desk.
桌子上有个杯子

四个字 ：地道英语