с модальными глаголами,

9. you/lock/door/when/leave
10. you/buy/a carton of milk -I/bought/some/yesterday ​

you should visit a doctor if you are ill

when you will go to the mountains you have to pack warm clothes

you mustn't go to the hospital if you only have a cold

we shouldnt leave the cooker on the kitchen

could you bring lifejacket i have two

we have to use the torch to see in the dark

you have to lock the dor when you leave

can you bay a carton of milk l bought some milk yesterday