English verb conjugation
MUST REGISTER

Regular verb: register - registered - registered

Affirmation

Simple form	V-ing form
I must register you must register she must register we must register you must register they must register	I must be registering you must be registering she must be registering we must be registering you must be registering they must be registering
Perfect	V-ing perfect
I must have registered you must have registered she must have registered we must have registered you must have registered they must have registered	I must have been registering you must have been registering she must have been registering we must have been registering you must have been registering they must have been registering

Negation

Simple form	V-ing form
I mustn't register you mustn't register she mustn't register we mustn't register you mustn't register they mustn't register	I mustn't be registering you mustn't be registering she mustn't be registering we mustn't be registering you mustn't be registering they mustn't be registering
Perfect	V-ing perfect
I mustn't have registered you mustn't have registered she mustn't have registered we mustn't have registered you mustn't have registered they mustn't have registered	I mustn't have been registering you mustn't have been registering she mustn't have been registering we mustn't have been registering you mustn't have been registering they mustn't have been registering

Interrogative form

Simple form	V-ing form
must I register? must you register? must she register? must we register? must you register? must they register?	must I be registering? must you be registering? must she be registering? must we be registering? must you be registering? must they be registering?
Perfect	V-ing perfect
must I have registered? must you have registered? must she have registered? must we have registered? must you have registered? must they have registered?	must I have been registering? must you have been registering? must she have been registering? must we have been registering? must you have been registering? must they have been registering?

Interro-negative form

Simple form	V-ing form
mustn't I register? mustn't you register? mustn't she register? mustn't we register? mustn't you register? mustn't they register?	mustn't I be registering? mustn't you be registering? mustn't she be registering? mustn't we be registering? mustn't you be registering? mustn't they be registering?
Perfect	V-ing perfect
mustn't I have registered? mustn't you have registered? mustn't she have registered? mustn't we have registered? mustn't you have registered? mustn't they have registered?	mustn't I have been registering? mustn't you have been registering? mustn't she have been registering? mustn't we have been registering? mustn't you have been registering? mustn't they have been registering?