could - might - should - would

Fill in the blanks with the right modal
1. I be happy, if we were on holiday. (conditionnel)
2. You help me, if you really wanted to. (capacité)
3. You think that it's easy, but it isn't. (probabilité)
4. In the past, I run faster. (capacité)
5. You listen to your friends, at least. (conseil)