335,
why not I wouldn't have 3pp, but I wouldn’t have to... ?
If I had learned earlier I wouldn’t have dealt with backlog of school.
so, I cut out second part of this 3rd conditional
and the result is
I wouldn’t have dealt with backlog of school.
Imagine a conversation:
Hi Tomek!
-Hi Marta!
-Can we go for a walk?
I can't! I didn't learn at school. I have to deal with this backlog.
-You should have learnt at school!
I know. I wouldn’t have dealt with backlog of school.
...
I think you misundrestood a few parts of my post. It doesn't matter now. Question above is more important.
I should have learned that (at school, known that,…).
to learn that - it means - dowiadywać się
I would like to say: It's a pity that I didn't learn when I was at school, because now I have to deal with backlog of school.