English verb conjugation
MUST RAT

Regular verb: rat - ratted - ratted

Affirmation

Simple form	V-ing form
I must rat you must rat he must rat we must rat you must rat they must rat	I must be ratting you must be ratting he must be ratting we must be ratting you must be ratting they must be ratting
Perfect	V-ing perfect
I must have ratted you must have ratted he must have ratted we must have ratted you must have ratted they must have ratted	I must have been ratting you must have been ratting he must have been ratting we must have been ratting you must have been ratting they must have been ratting

Negation

Simple form	V-ing form
I mustn't rat you mustn't rat he mustn't rat we mustn't rat you mustn't rat they mustn't rat	I mustn't be ratting you mustn't be ratting he mustn't be ratting we mustn't be ratting you mustn't be ratting they mustn't be ratting
Perfect	V-ing perfect
I mustn't have ratted you mustn't have ratted he mustn't have ratted we mustn't have ratted you mustn't have ratted they mustn't have ratted	I mustn't have been ratting you mustn't have been ratting he mustn't have been ratting we mustn't have been ratting you mustn't have been ratting they mustn't have been ratting

Interrogative form

Simple form	V-ing form
must I rat? must you rat? must he rat? must we rat? must you rat? must they rat?	must I be ratting? must you be ratting? must he be ratting? must we be ratting? must you be ratting? must they be ratting?
Perfect	V-ing perfect
must I have ratted? must you have ratted? must he have ratted? must we have ratted? must you have ratted? must they have ratted?	must I have been ratting? must you have been ratting? must he have been ratting? must we have been ratting? must you have been ratting? must they have been ratting?

Interro-negative form

Simple form	V-ing form
mustn't I rat? mustn't you rat? mustn't he rat? mustn't we rat? mustn't you rat? mustn't they rat?	mustn't I be ratting? mustn't you be ratting? mustn't he be ratting? mustn't we be ratting? mustn't you be ratting? mustn't they be ratting?
Perfect	V-ing perfect
mustn't I have ratted? mustn't you have ratted? mustn't he have ratted? mustn't we have ratted? mustn't you have ratted? mustn't they have ratted?	mustn't I have been ratting? mustn't you have been ratting? mustn't he have been ratting? mustn't we have been ratting? mustn't you have been ratting? mustn't they have been ratting?