English verb conjugation
MUST CENTRE

Regular verb: centre - centred - centred

Affirmation

Simple form	V-ing form
I must centre you must centre he must centre we must centre you must centre they must centre	I must be centring you must be centring he must be centring we must be centring you must be centring they must be centring
Perfect	V-ing perfect
I must have centred you must have centred he must have centred we must have centred you must have centred they must have centred	I must have been centring you must have been centring he must have been centring we must have been centring you must have been centring they must have been centring

Negation

Simple form	V-ing form
I mustn't centre you mustn't centre he mustn't centre we mustn't centre you mustn't centre they mustn't centre	I mustn't be centring you mustn't be centring he mustn't be centring we mustn't be centring you mustn't be centring they mustn't be centring
Perfect	V-ing perfect
I mustn't have centred you mustn't have centred he mustn't have centred we mustn't have centred you mustn't have centred they mustn't have centred	I mustn't have been centring you mustn't have been centring he mustn't have been centring we mustn't have been centring you mustn't have been centring they mustn't have been centring

Interrogative form

Simple form	V-ing form
must I centre? must you centre? must he centre? must we centre? must you centre? must they centre?	must I be centring? must you be centring? must he be centring? must we be centring? must you be centring? must they be centring?
Perfect	V-ing perfect
must I have centred? must you have centred? must he have centred? must we have centred? must you have centred? must they have centred?	must I have been centring? must you have been centring? must he have been centring? must we have been centring? must you have been centring? must they have been centring?

Interro-negative form

Simple form	V-ing form
mustn't I centre? mustn't you centre? mustn't he centre? mustn't we centre? mustn't you centre? mustn't they centre?	mustn't I be centring? mustn't you be centring? mustn't he be centring? mustn't we be centring? mustn't you be centring? mustn't they be centring?
Perfect	V-ing perfect
mustn't I have centred? mustn't you have centred? mustn't he have centred? mustn't we have centred? mustn't you have centred? mustn't they have centred?	mustn't I have been centring? mustn't you have been centring? mustn't he have been centring? mustn't we have been centring? mustn't you have been centring? mustn't they have been centring?