English verb conjugation
MUST SPAR

Regular verb: spar - sparred - sparred

Affirmation

Simple form	V-ing form
I must spar you must spar he must spar we must spar you must spar they must spar	I must be sparring you must be sparring he must be sparring we must be sparring you must be sparring they must be sparring
Perfect	V-ing perfect
I must have sparred you must have sparred he must have sparred we must have sparred you must have sparred they must have sparred	I must have been sparring you must have been sparring he must have been sparring we must have been sparring you must have been sparring they must have been sparring

Negation

Simple form	V-ing form
I mustn't spar you mustn't spar he mustn't spar we mustn't spar you mustn't spar they mustn't spar	I mustn't be sparring you mustn't be sparring he mustn't be sparring we mustn't be sparring you mustn't be sparring they mustn't be sparring
Perfect	V-ing perfect
I mustn't have sparred you mustn't have sparred he mustn't have sparred we mustn't have sparred you mustn't have sparred they mustn't have sparred	I mustn't have been sparring you mustn't have been sparring he mustn't have been sparring we mustn't have been sparring you mustn't have been sparring they mustn't have been sparring

Interrogative form

Simple form	V-ing form
must I spar? must you spar? must he spar? must we spar? must you spar? must they spar?	must I be sparring? must you be sparring? must he be sparring? must we be sparring? must you be sparring? must they be sparring?
Perfect	V-ing perfect
must I have sparred? must you have sparred? must he have sparred? must we have sparred? must you have sparred? must they have sparred?	must I have been sparring? must you have been sparring? must he have been sparring? must we have been sparring? must you have been sparring? must they have been sparring?

Interro-negative form

Simple form	V-ing form
mustn't I spar? mustn't you spar? mustn't he spar? mustn't we spar? mustn't you spar? mustn't they spar?	mustn't I be sparring? mustn't you be sparring? mustn't he be sparring? mustn't we be sparring? mustn't you be sparring? mustn't they be sparring?
Perfect	V-ing perfect
mustn't I have sparred? mustn't you have sparred? mustn't he have sparred? mustn't we have sparred? mustn't you have sparred? mustn't they have sparred?	mustn't I have been sparring? mustn't you have been sparring? mustn't he have been sparring? mustn't we have been sparring? mustn't you have been sparring? mustn't they have been sparring?