I've a touch of a cold. "That's too bad."
You mustn't format this floppy disk.
I really like him, but not his circle of friends.
Surely one shouldn't knock ash from your cigarette out the car window.
In case you sleep, set the alarm.
You had better not wear the red dress. "Why not?"
You must not jump to conclusions.
Don't rely too much on others.
Do not read books in such a dim room.
I can't go to the restaurant with you tonight.