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 must not roil
you must not roil
she must not roil
we must not roil
you must not roil
they must not roil 	I must not be roiling
you must not be roiling
she must not be roiling
we must not be roiling
you must not be roiling
they must not be roiling	I must not have roiled
you must not have roiled
she must not have roiled
we must not have roiled
you must not have roiled
they must not have roiled	I must not have been roiling
you must not have been roiling
she must not have been roiling
we must not have been roiling
you must not have been roiling
they must not 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 	
must I not roil?
must you not roil?
must she not roil?
must we not roil?
must you not roil?
must they not roil? 	must I not be roiling?
must you not be roiling?
must she not be roiling?
must we not be roiling?
must you not be roiling?
must they not be roiling? 	must I not have roiled?
must you not have roiled?
must she not have roiled?
must we not have roiled?
must you not have roiled?
must they not have roiled? 	must I not have been roiling?
must you not have been roiling?
must she not have been roiling?
must we not have been roiling?
must you not have been roiling?
must they not have been roiling?