future
You should water flowers
past
You should have washed up
future
You should call him back
past
You needn't have asked them. We did it
future
You should wash up/wash the dishes
past
You should have helped your mum
past
You needn't have bought any food
past
You should have watered flowers
past
You shouldn't have eaten so much
past
You should have called him back
past
You shouldn't have gone for a walk
past
You shouldn't have said it
past
You should have gone to bed earlier
future
You should walk your dog
future
You should help your mum
past
You shouldn't have drunk cold water