Mixed Conditionals

[jack]

What do these mean?

1. If it wasn't for you, I wouldn't have been in jail.
2. If it hadn't been you, I wouldn't have been in jail.

3. If it hadn't been for you, I wouldn't have been in jail. (Is 'for' incorrect here? Why?)

Thanks.

[Tdol]

You need 'for' there, and in #2. There's little difference between 1 and 2. 2 follows the traditional grammar pattern, but 1 could be used when speaking to the person, especially if they haven't changed and you are still angry with them for sending you to jail.

[jack]

http://mthobby.pcperfect.com/ch601/chconstpages.htm

What do these mean?
1. If my skills in estimating and managing IT projects would have been that bad, I would have fired myself a few times... (What kind of conditional is this? Is it a mixed conditional?)
2. If my skills in estimating and managing IT projects had been that bad, I would have fired myself a few times... (Past Conditional?)

[jack]

1. If it wasn't for you, I wouldn't have been in jail.
2. If it hadn't been for you, I wouldn't have been in jail.

The ones above are correct.

What about these ones? What do they mean? If they're not correct, why?

1. I could have made half a grand if they had it in stock. (If this is wrong, why? #1 is correct? Or does that type of mixed condtional only work sometimes?)
2. I could have made half a grand if they had got it in stock.
Thanks.

[Tdol]

I'd say 'if they'd had it in stock' (had had)

[jack]

2. I could have made half a grand if they had got it in stock.

I still don't really understand why the one above is wrong. Could you explain it to me? Is that past perfect+past Perfect? Thanks.