must roost
Regular verb: roost - roosted- roosted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must roost
you must roost
he must roost
we must roost
you must roost
they must roost 	I must be roosting
you must be roosting
he must be roosting
we must be roosting
you must be roosting
they must be roosting	I must have roosted
you must have roosted
he must have roosted
we must have roosted
you must have roosted
they must have roosted	I must have been roosting
you must have been roosting
he must have been roosting
we must have been roosting
you must have been roosting
they must have been roosting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't roost
you mustn't roost
he mustn't roost
we mustn't roost
you mustn't roost
they mustn't roost 	I mustn't be roosting
you mustn't be roosting
he mustn't be roosting
we mustn't be roosting
you mustn't be roosting
they mustn't be roosting	I mustn't have roosted
you mustn't have roosted
he mustn't have roosted
we mustn't have roosted
you mustn't have roosted
they mustn't have roosted	I mustn't have been roosting
you mustn't have been roosting
he mustn't have been roosting
we mustn't have been roosting
you mustn't have been roosting
they mustn't have been roosting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I roost?
must you roost?
must he roost?
must we roost?
must you roost?
must they roost? 	must I be roosting?
must you be roosting?
must he be roosting?
must we be roosting?
must you be roosting?
must they be roosting? 	must I have roosted?
must you have roosted?
must he have roosted?
must we have roosted?
must you have roosted?
must they have roosted? 	must I have been roosting?
must you have been roosting?
must he have been roosting?
must we have been roosting?
must you have been roosting?
must they have been roosting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I roost?
mustn't you roost?
mustn't he roost?
mustn't we roost?
mustn't you roost?
mustn't they roost? 	mustn't I be roosting?
mustn't you be roosting?
mustn't he be roosting?
mustn't we be roosting?
mustn't you be roosting?
mustn't they be roosting? 	mustn't I have roosted?
mustn't you have roosted?
mustn't he have roosted?
mustn't we have roosted?
mustn't you have roosted?
mustn't they have roosted? 	mustn't I have been roosting?
mustn't you have been roosting?
mustn't he have been roosting?
mustn't we have been roosting?
mustn't you have been roosting?
mustn't they have been roosting?