Please make sure you lock the door when you leave the house.

Please make sure you double-check your work before submitting it.

Please make sure you have your passport with you before you leave for the airport.

Please make sure you turn off all the lights when you leave the room.

Please make sure you read the instructions carefully before starting the experiment.

Please make sure you have enough gas in the car before going on a long trip.

Please make sure you wear comfortable shoes if you're going to be standing all day.

Please make sure you have all the necessary ingredients before you start cooking.

Please make sure you have the correct address before you send the package.

Please make sure you have your phone with you before you leave the house.