Which are correct:
1-Why should you cook and he wash the dishes?
2-Why should you cook while he washes the dishes?
3-Why should you cook when he washes the dishes?
4-Why should you cook as he washes the dishes?
I think 4 implies that the two actions are happening simultaneously, but do 3 and 2 have the same implication? Could they be used if the dish-washing takes place after the cooking (as it normally does)?
Is 1 correct as it is?