" i would have visited the hospital, if i had known you were sick . "

Ex 1 . 
1. " i would have visited the hospital , if i had known you were sick . "
2. " don't touch this button! " 
3. " make sure you arrive early ! "
4. " would you mind telling me how to get to the post-office , please ? "
5. " please don't forget my pen ."
6. " remember to study hard ! "
7. " please buy some milk on your way home ."
8. " could you give me the vase on the table , please ? "