I must plague you must plague she must plague we must plague you must plague they must plague
V-ing form
I must be plaguing you must be plaguing she must be plaguing we must be plaguing you must be plaguing they must be plaguing
Perfect
I must have plagued you must have plagued she must have plagued we must have plagued you must have plagued they must have plagued
V-ing perfect
I must have been plaguing you must have been plaguing she must have been plaguing we must have been plaguing you must have been plaguing they must have been plaguing
Negation
Simple form
I must not plague you must not plague she must not plague we must not plague you must not plague they must not plague
V-ing form
I must not be plaguing you must not be plaguing she must not be plaguing we must not be plaguing you must not be plaguing they must not be plaguing
Perfect
I must not have plagued you must not have plagued she must not have plagued we must not have plagued you must not have plagued they must not have plagued
V-ing perfect
I must not have been plaguing you must not have been plaguing she must not have been plaguing we must not have been plaguing you must not have been plaguing they must not have been plaguing
Interrogative form
Simple form
must I plague? must you plague? must she plague? must we plague? must you plague? must they plague?
V-ing form
must I be plaguing? must you be plaguing? must she be plaguing? must we be plaguing? must you be plaguing? must they be plaguing?
Perfect
must I have plagued? must you have plagued? must she have plagued? must we have plagued? must you have plagued? must they have plagued?
V-ing perfect
must I have been plaguing? must you have been plaguing? must she have been plaguing? must we have been plaguing? must you have been plaguing? must they have been plaguing?
Interro-negative form
Simple form
must I not plague? must you not plague? must she not plague? must we not plague? must you not plague? must they not plague?
V-ing form
must I not be plaguing? must you not be plaguing? must she not be plaguing? must we not be plaguing? must you not be plaguing? must they not be plaguing?
Perfect
must I not have plagued? must you not have plagued? must she not have plagued? must we not have plagued? must you not have plagued? must they not have plagued?
V-ing perfect
must I not have been plaguing? must you not have been plaguing? must she not have been plaguing? must we not have been plaguing? must you not have been plaguing? must they not have been plaguing?