I must protect you must protect she must protect we must protect you must protect they must protect
V-ing form
I must be protecting you must be protecting she must be protecting we must be protecting you must be protecting they must be protecting
Perfect
I must have protected you must have protected she must have protected we must have protected you must have protected they must have protected
V-ing perfect
I must have been protecting you must have been protecting she must have been protecting we must have been protecting you must have been protecting they must have been protecting
Negation
Simple form
I mustn't protect you mustn't protect she mustn't protect we mustn't protect you mustn't protect they mustn't protect
V-ing form
I mustn't be protecting you mustn't be protecting she mustn't be protecting we mustn't be protecting you mustn't be protecting they mustn't be protecting
Perfect
I mustn't have protected you mustn't have protected she mustn't have protected we mustn't have protected you mustn't have protected they mustn't have protected
V-ing perfect
I mustn't have been protecting you mustn't have been protecting she mustn't have been protecting we mustn't have been protecting you mustn't have been protecting they mustn't have been protecting
Interrogative form
Simple form
must I protect? must you protect? must she protect? must we protect? must you protect? must they protect?
V-ing form
must I be protecting? must you be protecting? must she be protecting? must we be protecting? must you be protecting? must they be protecting?
Perfect
must I have protected? must you have protected? must she have protected? must we have protected? must you have protected? must they have protected?
V-ing perfect
must I have been protecting? must you have been protecting? must she have been protecting? must we have been protecting? must you have been protecting? must they have been protecting?
Interro-negative form
Simple form
mustn't I protect? mustn't you protect? mustn't she protect? mustn't we protect? mustn't you protect? mustn't they protect?
V-ing form
mustn't I be protecting? mustn't you be protecting? mustn't she be protecting? mustn't we be protecting? mustn't you be protecting? mustn't they be protecting?
Perfect
mustn't I have protected? mustn't you have protected? mustn't she have protected? mustn't we have protected? mustn't you have protected? mustn't they have protected?
V-ing perfect
mustn't I have been protecting? mustn't you have been protecting? mustn't she have been protecting? mustn't we have been protecting? mustn't you have been protecting? mustn't they have been protecting?