英语翻译This is where I start to bite my nails.这是什么从句从句分哪些 分别介绍一

英语翻译
This is where I start to bite my nails.
这是什么从句
从句分哪些 分别介绍一下、
还有为什么是he wasn't 不是he isn't
This is where I start to bite my nails.
And clean my room when all else fails.
I think it's time for me to bail.
This point of view is getting stale.
这段从句的问题 和翻译