English verb conjugation
MUST SPEARFISH

Regular verb: spearfish - spearfished - spearfished

Affirmation

Simple form	V-ing form
I must spearfish you must spearfish she must spearfish we must spearfish you must spearfish they must spearfish	I must be spearfishing you must be spearfishing she must be spearfishing we must be spearfishing you must be spearfishing they must be spearfishing
Perfect	V-ing perfect
I must have spearfished you must have spearfished she must have spearfished we must have spearfished you must have spearfished they must have spearfished	I must have been spearfishing you must have been spearfishing she must have been spearfishing we must have been spearfishing you must have been spearfishing they must have been spearfishing

Negation

Simple form	V-ing form
I mustn't spearfish you mustn't spearfish she mustn't spearfish we mustn't spearfish you mustn't spearfish they mustn't spearfish	I mustn't be spearfishing you mustn't be spearfishing she mustn't be spearfishing we mustn't be spearfishing you mustn't be spearfishing they mustn't be spearfishing
Perfect	V-ing perfect
I mustn't have spearfished you mustn't have spearfished she mustn't have spearfished we mustn't have spearfished you mustn't have spearfished they mustn't have spearfished	I mustn't have been spearfishing you mustn't have been spearfishing she mustn't have been spearfishing we mustn't have been spearfishing you mustn't have been spearfishing they mustn't have been spearfishing

Interrogative form

Simple form	V-ing form
must I spearfish? must you spearfish? must she spearfish? must we spearfish? must you spearfish? must they spearfish?	must I be spearfishing? must you be spearfishing? must she be spearfishing? must we be spearfishing? must you be spearfishing? must they be spearfishing?
Perfect	V-ing perfect
must I have spearfished? must you have spearfished? must she have spearfished? must we have spearfished? must you have spearfished? must they have spearfished?	must I have been spearfishing? must you have been spearfishing? must she have been spearfishing? must we have been spearfishing? must you have been spearfishing? must they have been spearfishing?

Interro-negative form

Simple form	V-ing form
mustn't I spearfish? mustn't you spearfish? mustn't she spearfish? mustn't we spearfish? mustn't you spearfish? mustn't they spearfish?	mustn't I be spearfishing? mustn't you be spearfishing? mustn't she be spearfishing? mustn't we be spearfishing? mustn't you be spearfishing? mustn't they be spearfishing?
Perfect	V-ing perfect
mustn't I have spearfished? mustn't you have spearfished? mustn't she have spearfished? mustn't we have spearfished? mustn't you have spearfished? mustn't they have spearfished?	mustn't I have been spearfishing? mustn't you have been spearfishing? mustn't she have been spearfishing? mustn't we have been spearfishing? mustn't you have been spearfishing? mustn't they have been spearfishing?