Text: it would be very dangerous to write, "dear uncle george: for the last year and a half, all the money you've been sending me to buy a house with, i have been spending on a blonde named floozie." well, he'd have to figure out how to handle that so that there wasn't any danger in it. and it might take quite a bit of thinking.

Correct capitalization: It would be very dangerous to write, "Dear Uncle George: For the last year and a half, all the money you've been sending me to buy a house with, I have been spending on a blonde named Floozie." Well, he'd have to figure out how to handle that so that there wasn't any danger in it. And it might take quite a bit of thinking.

Text: in short, he should walk around the block and look at things until he sees the things he is walking near. it does not matter how many times he walks around the block, he should walk around the block until he feels better.

Correct capitalization: In short, he should walk around the block and look at things until he sees the things he is walking near. It does not matter how many times he walks around the block, he should walk around the block until he feels better.

Text: they are all quite different, they belong somewhere else.

Correct capitalization: They are all quite different, they belong somewhere else.

Text: but how should you choose a language to study? i think the first language you study should be one that will be most [...]

Correct capitalization:
But how should you choose a language to study? I think the first language you study should be one that will be most [...]