must knacker
Verbo regular: knacker - knackered- knackered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must knacker
you must knacker
she must knacker
we must knacker
you must knacker
they must knacker 	I must be knackering
you must be knackering
she must be knackering
we must be knackering
you must be knackering
they must be knackering	I must have knackered
you must have knackered
she 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
she must have been knackering
we must have been knackering
you must have been knackering
they must have been knackering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not knacker
you must not knacker
she must not knacker
we must not knacker
you must not knacker
they must not knacker 	I must not be knackering
you must not be knackering
she must not be knackering
we must not be knackering
you must not be knackering
they must not be knackering	I must not have knackered
you must not have knackered
she must not have knackered
we must not have knackered
you must not have knackered
they must not have knackered	I must not have been knackering
you must not have been knackering
she must not have been knackering
we must not have been knackering
you must not have been knackering
they must not have been knackering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I knacker?
must you knacker?
must she knacker?
must we knacker?
must you knacker?
must they knacker? 	must I be knackering?
must you be knackering?
must she be knackering?
must we be knackering?
must you be knackering?
must they be knackering? 	must I have knackered?
must you have knackered?
must she 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 she have been knackering?
must we have been knackering?
must you have been knackering?
must they have been knackering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not knacker?
must you not knacker?
must she not knacker?
must we not knacker?
must you not knacker?
must they not knacker? 	must I not be knackering?
must you not be knackering?
must she not be knackering?
must we not be knackering?
must you not be knackering?
must they not be knackering? 	must I not have knackered?
must you not have knackered?
must she not have knackered?
must we not have knackered?
must you not have knackered?
must they not have knackered? 	must I not have been knackering?
must you not have been knackering?
must she not have been knackering?
must we not have been knackering?
must you not have been knackering?
must they not have been knackering?