must plague
Regular verb: plague - plagued- plagued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must plague
you must plague
he must plague
we must plague
you must plague
they must plague 	I must be plaguing
you must be plaguing
he must be plaguing
we must be plaguing
you must be plaguing
they must be plaguing	I must have plagued
you must have plagued
he must have plagued
we must have plagued
you must have plagued
they must have plagued	I must have been plaguing
you must have been plaguing
he must have been plaguing
we must have been plaguing
you must have been plaguing
they must have been plaguing	

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

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