thisis和thereis我看到这样一个句子：althoughthisviewiswildlyheld,thisisnoevidencethateducationcanbeobtainedatanyageandatanyplace为什么这里用的是thisis而不是thereis呢?还有一句：Manycityresidents

Question

this is 和 there is
我看到这样一个句子：although this view is wildly held,this is no evidence that education can be obtained at any age and at any place
为什么这里用的是this is 而不是there is呢?
还有一句：Many city residents complain that it is so few buses in their ciy that they have to spend much more time waiting for a bus，which is usually crowded with a large number of people.为什么用it is 也不是强调句呀

Answer 1

this 在这里是有特指的,指前一个分句,即this view is wildly held这一事实,而不是泛泛地说没有证据表明,而是这一事实不构成……的证据,不是……的证据.
而补充中的it实际上是一个固定结构it's so ...that...什么太如何以致于……