must roust
Regular verb: roust - rousted- rousted

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