Some Very important questions.

Hello, and thank you for taking the time to answer me.

I have a couple of questions to ask:

1.I would like to know the difference between "I would be grateful if you would show up" and "I would be grateful if you showed up"

2. I would like to know the difference between "he quit because they would always bench him" and he "quit because they always benched him" (both are in past tense, not talking about "they would bench him if he stayed)

Another example :

1.When he was on spain he was traveling all the time

2.When he was in spain he would travel all the time

3.When he was in spain he traveled all the time

Thank you!