1. may (just) as well do sth.
may as well do sth. 表示“不妨；倒不如”，用来提出建议。如：
We may as well have a try and see if it can be done.
There is nothing to do, so I may as well go to bed.
might as well也可表示“不妨”，但语气更委婉一些。其也是may as well的过去时形式。如：
Since she had come up to London, she might as well speak her mind.
2. As far as I know ．．．
as far as 表示“就……而言；从……来看”。as far as I know就我知道的而言；as far as I can see就我能看到的而言；as far as they are
concerned 就他们而论；as far as the eye can reach 就视力所及。如：
As far as I know, he isn't coming to the party.
As far as I am concerned, I cannot object to your marriage.
as far as还可表示“到某一指定地点；一直到（某地）”。如：
They walked as far as the foot of a mountain.
I'll see you off as far as the airport.
_______ I can see, there is only one possible way to keep away from the danger. (北京2004春)
A. As long as B. As far as C. Just as D. Even if
3. That sort of thing.
That sort of thing. 独立使用时，为一省略结构。如：
Home is happiness and sweetness. That sort of thing（=Home is that sort of thing）.
这一结构通常应该是and that sort of thing，表示“等等诸如此类的事”。如：
The store sells socks, gloves, caps and that sort of thing.