must roost
Verbe régulier : roost - roosted- roosted
Traduction française : se percher - (se) jucher 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must roost
you must roost
she must roost
we must roost
you must roost
they must roost 	I must be roosting
you must be roosting
she must be roosting
we must be roosting
you must be roosting
they must be roosting	I must have roosted
you must have roosted
she 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
she must have been roosting
we must have been roosting
you must have been roosting
they must have been roosting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't roost
you mustn't roost
she 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
she 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
she 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
she mustn't have been roosting
we mustn't have been roosting
you mustn't have been roosting
they mustn't have been roosting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I roost?
must you roost?
must she roost?
must we roost?
must you roost?
must they roost? 	must I be roosting?
must you be roosting?
must she be roosting?
must we be roosting?
must you be roosting?
must they be roosting? 	must I have roosted?
must you have roosted?
must she 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 she have been roosting?
must we have been roosting?
must you have been roosting?
must they have been roosting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I roost?
mustn't you roost?
mustn't she 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 she 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 she 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 she have been roosting?
mustn't we have been roosting?
mustn't you have been roosting?
mustn't they have been roosting?