must speck
Regular verb: speck - specked- specked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must speck
you must speck
he must speck
we must speck
you must speck
they must speck 	I must be specking
you must be specking
he must be specking
we must be specking
you must be specking
they must be specking	I must have specked
you must have specked
he must have specked
we must have specked
you must have specked
they must have specked	I must have been specking
you must have been specking
he must have been specking
we must have been specking
you must have been specking
they must have been specking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't speck
you mustn't speck
he mustn't speck
we mustn't speck
you mustn't speck
they mustn't speck 	I mustn't be specking
you mustn't be specking
he mustn't be specking
we mustn't be specking
you mustn't be specking
they mustn't be specking	I mustn't have specked
you mustn't have specked
he mustn't have specked
we mustn't have specked
you mustn't have specked
they mustn't have specked	I mustn't have been specking
you mustn't have been specking
he mustn't have been specking
we mustn't have been specking
you mustn't have been specking
they mustn't have been specking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I speck?
must you speck?
must he speck?
must we speck?
must you speck?
must they speck? 	must I be specking?
must you be specking?
must he be specking?
must we be specking?
must you be specking?
must they be specking? 	must I have specked?
must you have specked?
must he have specked?
must we have specked?
must you have specked?
must they have specked? 	must I have been specking?
must you have been specking?
must he have been specking?
must we have been specking?
must you have been specking?
must they have been specking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I speck?
mustn't you speck?
mustn't he speck?
mustn't we speck?
mustn't you speck?
mustn't they speck? 	mustn't I be specking?
mustn't you be specking?
mustn't he be specking?
mustn't we be specking?
mustn't you be specking?
mustn't they be specking? 	mustn't I have specked?
mustn't you have specked?
mustn't he have specked?
mustn't we have specked?
mustn't you have specked?
mustn't they have specked? 	mustn't I have been specking?
mustn't you have been specking?
mustn't he have been specking?
mustn't we have been specking?
mustn't you have been specking?
mustn't they have been specking?