You must do as I say. Or you will face punishment.
The verb in this sentence is the word "is." When you use the verb "to be," you must use the correct form of it.
I must cancel my doctor's appointment.
You must be patient and persistent.
This student must have an anatomical defect, because he cannot write this sentence for himself.
There is no sentence with the word schooner in it I must be dreaming if there is I need help with this question
He had diffuse pain from his hips to his feet. We must diffuse the chemicals throughout the large pond.
First, you must know the meaning of a word or a phrase before you can use it in a sentence. Then it will be easy.
That must have been so embarrassing
To by a new house you must have a contractual with the owner.
That detestable warlord Khan must fall!
Must you act like a brigand?
This renewable resource must be promoted!