must roil
Regular verb: roil - roiled- roiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must roil
you must roil
she must roil
we must roil
you must roil
they must roil 	I must be roiling
you must be roiling
she must be roiling
we must be roiling
you must be roiling
they must be roiling	I must have roiled
you must have roiled
she must have roiled
we must have roiled
you must have roiled
they must have roiled	I must have been roiling
you must have been roiling
she must have been roiling
we must have been roiling
you must have been roiling
they must have been roiling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't roil
you mustn't roil
she mustn't roil
we mustn't roil
you mustn't roil
they mustn't roil 	I mustn't be roiling
you mustn't be roiling
she mustn't be roiling
we mustn't be roiling
you mustn't be roiling
they mustn't be roiling	I mustn't have roiled
you mustn't have roiled
she mustn't have roiled
we mustn't have roiled
you mustn't have roiled
they mustn't have roiled	I mustn't have been roiling
you mustn't have been roiling
she mustn't have been roiling
we mustn't have been roiling
you mustn't have been roiling
they mustn't have been roiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I roil?
must you roil?
must she roil?
must we roil?
must you roil?
must they roil? 	must I be roiling?
must you be roiling?
must she be roiling?
must we be roiling?
must you be roiling?
must they be roiling? 	must I have roiled?
must you have roiled?
must she have roiled?
must we have roiled?
must you have roiled?
must they have roiled? 	must I have been roiling?
must you have been roiling?
must she have been roiling?
must we have been roiling?
must you have been roiling?
must they have been roiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I roil?
mustn't you roil?
mustn't she roil?
mustn't we roil?
mustn't you roil?
mustn't they roil? 	mustn't I be roiling?
mustn't you be roiling?
mustn't she be roiling?
mustn't we be roiling?
mustn't you be roiling?
mustn't they be roiling? 	mustn't I have roiled?
mustn't you have roiled?
mustn't she have roiled?
mustn't we have roiled?
mustn't you have roiled?
mustn't they have roiled? 	mustn't I have been roiling?
mustn't you have been roiling?
mustn't she have been roiling?
mustn't we have been roiling?
mustn't you have been roiling?
mustn't they have been roiling?