You may not be able to open that. - You might not be able to open that.
You may not be able to open that.
You might not be able to open that.
The door was difficult to open. - The door was hard to open.
The door was difficult to open.
The door was hard to open.
Please open the door. - Open the door, please.
Please open the door.
Open the door, please.
Open the door, please. - Please open the door.