English verb conjugation
MUST ROOST

Regular verb: roost - roosted - roosted

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

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

Interro-negative form

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