I must protect you must protect he must protect we must protect you must protect they must protect
V-ing form
I must be protecting you must be protecting he must be protecting we must be protecting you must be protecting they must be protecting
Perfect
I must have protected you must have protected he 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 he must have been protecting we must have been protecting you must have been protecting they must have been protecting
Negation
Simple form
I must not protect you must not protect he must not protect we must not protect you must not protect they must not protect
V-ing form
I must not be protecting you must not be protecting he must not be protecting we must not be protecting you must not be protecting they must not be protecting
Perfect
I must not have protected you must not have protected he must not have protected we must not have protected you must not have protected they must not have protected
V-ing perfect
I must not have been protecting you must not have been protecting he must not have been protecting we must not have been protecting you must not have been protecting they must not have been protecting
Interrogative form
Simple form
must I protect? must you protect? must he protect? must we protect? must you protect? must they protect?
V-ing form
must I be protecting? must you be protecting? must he be protecting? must we be protecting? must you be protecting? must they be protecting?
Perfect
must I have protected? must you have protected? must he 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 he have been protecting? must we have been protecting? must you have been protecting? must they have been protecting?
Interro-negative form
Simple form
must I not protect? must you not protect? must he not protect? must we not protect? must you not protect? must they not protect?
V-ing form
must I not be protecting? must you not be protecting? must he not be protecting? must we not be protecting? must you not be protecting? must they not be protecting?
Perfect
must I not have protected? must you not have protected? must he not have protected? must we not have protected? must you not have protected? must they not have protected?
V-ing perfect
must I not have been protecting? must you not have been protecting? must he not have been protecting? must we not have been protecting? must you not have been protecting? must they not have been protecting?