must sulk
Regular verb: sulk - sulked- sulked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sulk
you must sulk
he must sulk
we must sulk
you must sulk
they must sulk 	I must be sulking
you must be sulking
he must be sulking
we must be sulking
you must be sulking
they must be sulking	I must have sulked
you must have sulked
he must have sulked
we must have sulked
you must have sulked
they must have sulked	I must have been sulking
you must have been sulking
he must have been sulking
we must have been sulking
you must have been sulking
they must have been sulking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not sulk
you must not sulk
he must not sulk
we must not sulk
you must not sulk
they must not sulk 	I must not be sulking
you must not be sulking
he must not be sulking
we must not be sulking
you must not be sulking
they must not be sulking	I must not have sulked
you must not have sulked
he must not have sulked
we must not have sulked
you must not have sulked
they must not have sulked	I must not have been sulking
you must not have been sulking
he must not have been sulking
we must not have been sulking
you must not have been sulking
they must not have been sulking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sulk?
must you sulk?
must he sulk?
must we sulk?
must you sulk?
must they sulk? 	must I be sulking?
must you be sulking?
must he be sulking?
must we be sulking?
must you be sulking?
must they be sulking? 	must I have sulked?
must you have sulked?
must he have sulked?
must we have sulked?
must you have sulked?
must they have sulked? 	must I have been sulking?
must you have been sulking?
must he have been sulking?
must we have been sulking?
must you have been sulking?
must they have been sulking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not sulk?
must you not sulk?
must he not sulk?
must we not sulk?
must you not sulk?
must they not sulk? 	must I not be sulking?
must you not be sulking?
must he not be sulking?
must we not be sulking?
must you not be sulking?
must they not be sulking? 	must I not have sulked?
must you not have sulked?
must he not have sulked?
must we not have sulked?
must you not have sulked?
must they not have sulked? 	must I not have been sulking?
must you not have been sulking?
must he not have been sulking?
must we not have been sulking?
must you not have been sulking?
must they not have been sulking?