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 must not spar you must not spar he must not spar we must not spar you must not spar they must not spar	I must not be sparring you must not be sparring he must not be sparring we must not be sparring you must not be sparring they must not be sparring
Perfect	V-ing perfect
I must not have sparred you must not have sparred he must not have sparred we must not have sparred you must not have sparred they must not have sparred	I must not have been sparring you must not have been sparring he must not have been sparring we must not have been sparring you must not have been sparring they must not 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
must I not spar? must you not spar? must he not spar? must we not spar? must you not spar? must they not spar?	must I not be sparring? must you not be sparring? must he not be sparring? must we not be sparring? must you not be sparring? must they not be sparring?
Perfect	V-ing perfect
must I not have sparred? must you not have sparred? must he not have sparred? must we not have sparred? must you not have sparred? must they not have sparred?	must I not have been sparring? must you not have been sparring? must he not have been sparring? must we not have been sparring? must you not have been sparring? must they not have been sparring?