must skulk
Verbo regular: skulk - skulked- skulked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must skulk
you must skulk
he must skulk
we must skulk
you must skulk
they must skulk 	I must be skulking
you must be skulking
he must be skulking
we must be skulking
you must be skulking
they must be skulking	I must have skulked
you must have skulked
he must have skulked
we must have skulked
you must have skulked
they must have skulked	I must have been skulking
you must have been skulking
he must have been skulking
we must have been skulking
you must have been skulking
they must have been skulking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not skulk
you must not skulk
he must not skulk
we must not skulk
you must not skulk
they must not skulk 	I must not be skulking
you must not be skulking
he must not be skulking
we must not be skulking
you must not be skulking
they must not be skulking	I must not have skulked
you must not have skulked
he must not have skulked
we must not have skulked
you must not have skulked
they must not have skulked	I must not have been skulking
you must not have been skulking
he must not have been skulking
we must not have been skulking
you must not have been skulking
they must not have been skulking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I skulk?
must you skulk?
must he skulk?
must we skulk?
must you skulk?
must they skulk? 	must I be skulking?
must you be skulking?
must he be skulking?
must we be skulking?
must you be skulking?
must they be skulking? 	must I have skulked?
must you have skulked?
must he have skulked?
must we have skulked?
must you have skulked?
must they have skulked? 	must I have been skulking?
must you have been skulking?
must he have been skulking?
must we have been skulking?
must you have been skulking?
must they have been skulking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not skulk?
must you not skulk?
must he not skulk?
must we not skulk?
must you not skulk?
must they not skulk? 	must I not be skulking?
must you not be skulking?
must he not be skulking?
must we not be skulking?
must you not be skulking?
must they not be skulking? 	must I not have skulked?
must you not have skulked?
must he not have skulked?
must we not have skulked?
must you not have skulked?
must they not have skulked? 	must I not have been skulking?
must you not have been skulking?
must he not have been skulking?
must we not have been skulking?
must you not have been skulking?
must they not have been skulking?