must harpoon harpoon
Regular verb: harpoon harpoon - harpoon harpooned- harpoon harpooned

, this verb may not exist. Conjugation is given as example.

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must harpoon harpoon
you must harpoon harpoon
he must harpoon harpoon
we must harpoon harpoon
you must harpoon harpoon
they must harpoon harpoon 	I must be harpoon harpooning
you must be harpoon harpooning
he must be harpoon harpooning
we must be harpoon harpooning
you must be harpoon harpooning
they must be harpoon harpooning	I must have harpoon harpooned
you must have harpoon harpooned
he must have harpoon harpooned
we must have harpoon harpooned
you must have harpoon harpooned
they must have harpoon harpooned	I must have been harpoon harpooning
you must have been harpoon harpooning
he must have been harpoon harpooning
we must have been harpoon harpooning
you must have been harpoon harpooning
they must have been harpoon harpooning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't harpoon harpoon
you mustn't harpoon harpoon
he mustn't harpoon harpoon
we mustn't harpoon harpoon
you mustn't harpoon harpoon
they mustn't harpoon harpoon 	I mustn't be harpoon harpooning
you mustn't be harpoon harpooning
he mustn't be harpoon harpooning
we mustn't be harpoon harpooning
you mustn't be harpoon harpooning
they mustn't be harpoon harpooning	I mustn't have harpoon harpooned
you mustn't have harpoon harpooned
he mustn't have harpoon harpooned
we mustn't have harpoon harpooned
you mustn't have harpoon harpooned
they mustn't have harpoon harpooned	I mustn't have been harpoon harpooning
you mustn't have been harpoon harpooning
he mustn't have been harpoon harpooning
we mustn't have been harpoon harpooning
you mustn't have been harpoon harpooning
they mustn't have been harpoon harpooning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I harpoon harpoon?
must you harpoon harpoon?
must he harpoon harpoon?
must we harpoon harpoon?
must you harpoon harpoon?
must they harpoon harpoon? 	must I be harpoon harpooning?
must you be harpoon harpooning?
must he be harpoon harpooning?
must we be harpoon harpooning?
must you be harpoon harpooning?
must they be harpoon harpooning? 	must I have harpoon harpooned?
must you have harpoon harpooned?
must he have harpoon harpooned?
must we have harpoon harpooned?
must you have harpoon harpooned?
must they have harpoon harpooned? 	must I have been harpoon harpooning?
must you have been harpoon harpooning?
must he have been harpoon harpooning?
must we have been harpoon harpooning?
must you have been harpoon harpooning?
must they have been harpoon harpooning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I harpoon harpoon?
mustn't you harpoon harpoon?
mustn't he harpoon harpoon?
mustn't we harpoon harpoon?
mustn't you harpoon harpoon?
mustn't they harpoon harpoon? 	mustn't I be harpoon harpooning?
mustn't you be harpoon harpooning?
mustn't he be harpoon harpooning?
mustn't we be harpoon harpooning?
mustn't you be harpoon harpooning?
mustn't they be harpoon harpooning? 	mustn't I have harpoon harpooned?
mustn't you have harpoon harpooned?
mustn't he have harpoon harpooned?
mustn't we have harpoon harpooned?
mustn't you have harpoon harpooned?
mustn't they have harpoon harpooned? 	mustn't I have been harpoon harpooning?
mustn't you have been harpoon harpooning?
mustn't he have been harpoon harpooning?
mustn't we have been harpoon harpooning?
mustn't you have been harpoon harpooning?
mustn't they have been harpoon harpooning?