must roust
Regular verb: roust - rousted- rousted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must roust
you must roust
she must roust
we must roust
you must roust
they must roust 	I must be rousting
you must be rousting
she must be rousting
we must be rousting
you must be rousting
they must be rousting	I must have rousted
you must have rousted
she must have rousted
we must have rousted
you must have rousted
they must have rousted	I must have been rousting
you must have been rousting
she must have been rousting
we must have been rousting
you must have been rousting
they must have been rousting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not roust
you must not roust
she must not roust
we must not roust
you must not roust
they must not roust 	I must not be rousting
you must not be rousting
she must not be rousting
we must not be rousting
you must not be rousting
they must not be rousting	I must not have rousted
you must not have rousted
she must not have rousted
we must not have rousted
you must not have rousted
they must not have rousted	I must not have been rousting
you must not have been rousting
she must not have been rousting
we must not have been rousting
you must not have been rousting
they must not have been rousting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I roust?
must you roust?
must she roust?
must we roust?
must you roust?
must they roust? 	must I be rousting?
must you be rousting?
must she be rousting?
must we be rousting?
must you be rousting?
must they be rousting? 	must I have rousted?
must you have rousted?
must she have rousted?
must we have rousted?
must you have rousted?
must they have rousted? 	must I have been rousting?
must you have been rousting?
must she have been rousting?
must we have been rousting?
must you have been rousting?
must they have been rousting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not roust?
must you not roust?
must she not roust?
must we not roust?
must you not roust?
must they not roust? 	must I not be rousting?
must you not be rousting?
must she not be rousting?
must we not be rousting?
must you not be rousting?
must they not be rousting? 	must I not have rousted?
must you not have rousted?
must she not have rousted?
must we not have rousted?
must you not have rousted?
must they not have rousted? 	must I not have been rousting?
must you not have been rousting?
must she not have been rousting?
must we not have been rousting?
must you not have been rousting?
must they not have been rousting?