English verb conjugation
MUST ROOST

Regular verb: roost - roosted - roosted

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?