English verb conjugation
MUST KNACKER

Regular verb: knacker - knackered - knackered

Affirmation

Simple form	V-ing form
I must knacker you must knacker he must knacker we must knacker you must knacker they must knacker	I must be knackering you must be knackering he must be knackering we must be knackering you must be knackering they must be knackering
Perfect	V-ing perfect
I must have knackered you must have knackered he must have knackered we must have knackered you must have knackered they must have knackered	I must have been knackering you must have been knackering he must have been knackering we must have been knackering you must have been knackering they must have been knackering

Negation

Simple form	V-ing form
I mustn't knacker you mustn't knacker he mustn't knacker we mustn't knacker you mustn't knacker they mustn't knacker	I mustn't be knackering you mustn't be knackering he mustn't be knackering we mustn't be knackering you mustn't be knackering they mustn't be knackering
Perfect	V-ing perfect
I mustn't have knackered you mustn't have knackered he mustn't have knackered we mustn't have knackered you mustn't have knackered they mustn't have knackered	I mustn't have been knackering you mustn't have been knackering he mustn't have been knackering we mustn't have been knackering you mustn't have been knackering they mustn't have been knackering

Interrogative form

Simple form	V-ing form
must I knacker? must you knacker? must he knacker? must we knacker? must you knacker? must they knacker?	must I be knackering? must you be knackering? must he be knackering? must we be knackering? must you be knackering? must they be knackering?
Perfect	V-ing perfect
must I have knackered? must you have knackered? must he have knackered? must we have knackered? must you have knackered? must they have knackered?	must I have been knackering? must you have been knackering? must he have been knackering? must we have been knackering? must you have been knackering? must they have been knackering?

Interro-negative form

Simple form	V-ing form
mustn't I knacker? mustn't you knacker? mustn't he knacker? mustn't we knacker? mustn't you knacker? mustn't they knacker?	mustn't I be knackering? mustn't you be knackering? mustn't he be knackering? mustn't we be knackering? mustn't you be knackering? mustn't they be knackering?
Perfect	V-ing perfect
mustn't I have knackered? mustn't you have knackered? mustn't he have knackered? mustn't we have knackered? mustn't you have knackered? mustn't they have knackered?	mustn't I have been knackering? mustn't you have been knackering? mustn't he have been knackering? mustn't we have been knackering? mustn't you have been knackering? mustn't they have been knackering?