must spike
Regular verb: spike - spiked- spiked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must spike
you must spike
he must spike
we must spike
you must spike
they must spike 	I must be spiking
you must be spiking
he must be spiking
we must be spiking
you must be spiking
they must be spiking	I must have spiked
you must have spiked
he must have spiked
we must have spiked
you must have spiked
they must have spiked	I must have been spiking
you must have been spiking
he must have been spiking
we must have been spiking
you must have been spiking
they must have been spiking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't spike
you mustn't spike
he mustn't spike
we mustn't spike
you mustn't spike
they mustn't spike 	I mustn't be spiking
you mustn't be spiking
he mustn't be spiking
we mustn't be spiking
you mustn't be spiking
they mustn't be spiking	I mustn't have spiked
you mustn't have spiked
he mustn't have spiked
we mustn't have spiked
you mustn't have spiked
they mustn't have spiked	I mustn't have been spiking
you mustn't have been spiking
he mustn't have been spiking
we mustn't have been spiking
you mustn't have been spiking
they mustn't have been spiking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I spike?
must you spike?
must he spike?
must we spike?
must you spike?
must they spike? 	must I be spiking?
must you be spiking?
must he be spiking?
must we be spiking?
must you be spiking?
must they be spiking? 	must I have spiked?
must you have spiked?
must he have spiked?
must we have spiked?
must you have spiked?
must they have spiked? 	must I have been spiking?
must you have been spiking?
must he have been spiking?
must we have been spiking?
must you have been spiking?
must they have been spiking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I spike?
mustn't you spike?
mustn't he spike?
mustn't we spike?
mustn't you spike?
mustn't they spike? 	mustn't I be spiking?
mustn't you be spiking?
mustn't he be spiking?
mustn't we be spiking?
mustn't you be spiking?
mustn't they be spiking? 	mustn't I have spiked?
mustn't you have spiked?
mustn't he have spiked?
mustn't we have spiked?
mustn't you have spiked?
mustn't they have spiked? 	mustn't I have been spiking?
mustn't you have been spiking?
mustn't he have been spiking?
mustn't we have been spiking?
mustn't you have been spiking?
mustn't they have been spiking?