must destain
Regular verb: destain - destained- destained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must destain
you must destain
she must destain
we must destain
you must destain
they must destain 	I must be destaining
you must be destaining
she must be destaining
we must be destaining
you must be destaining
they must be destaining	I must have destained
you must have destained
she must have destained
we must have destained
you must have destained
they must have destained	I must have been destaining
you must have been destaining
she must have been destaining
we must have been destaining
you must have been destaining
they must have been destaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not destain
you must not destain
she must not destain
we must not destain
you must not destain
they must not destain 	I must not be destaining
you must not be destaining
she must not be destaining
we must not be destaining
you must not be destaining
they must not be destaining	I must not have destained
you must not have destained
she must not have destained
we must not have destained
you must not have destained
they must not have destained	I must not have been destaining
you must not have been destaining
she must not have been destaining
we must not have been destaining
you must not have been destaining
they must not have been destaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I destain?
must you destain?
must she destain?
must we destain?
must you destain?
must they destain? 	must I be destaining?
must you be destaining?
must she be destaining?
must we be destaining?
must you be destaining?
must they be destaining? 	must I have destained?
must you have destained?
must she have destained?
must we have destained?
must you have destained?
must they have destained? 	must I have been destaining?
must you have been destaining?
must she have been destaining?
must we have been destaining?
must you have been destaining?
must they have been destaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not destain?
must you not destain?
must she not destain?
must we not destain?
must you not destain?
must they not destain? 	must I not be destaining?
must you not be destaining?
must she not be destaining?
must we not be destaining?
must you not be destaining?
must they not be destaining? 	must I not have destained?
must you not have destained?
must she not have destained?
must we not have destained?
must you not have destained?
must they not have destained? 	must I not have been destaining?
must you not have been destaining?
must she not have been destaining?
must we not have been destaining?
must you not have been destaining?
must they not have been destaining?