must spar
Regular verb: spar - sparred- sparred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must spar
you must spar
she must spar
we must spar
you must spar
they must spar 	I must be sparring
you must be sparring
she must be sparring
we must be sparring
you must be sparring
they must be sparring	I must have sparred
you must have sparred
she 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
she 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 	Perfect 	V-ing perfect 	
I must not spar
you must not spar
she 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
she must not be sparring
we must not be sparring
you must not be sparring
they must not be sparring	I must not have sparred
you must not have sparred
she 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
she 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 	Perfect 	V-ing perfect 	
must I spar?
must you spar?
must she spar?
must we spar?
must you spar?
must they spar? 	must I be sparring?
must you be sparring?
must she be sparring?
must we be sparring?
must you be sparring?
must they be sparring? 	must I have sparred?
must you have sparred?
must she 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 she 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 	Perfect 	V-ing perfect 	
must I not spar?
must you not spar?
must she 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 she not be sparring?
must we not be sparring?
must you not be sparring?
must they not be sparring? 	must I not have sparred?
must you not have sparred?
must she 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 she not have been sparring?
must we not have been sparring?
must you not have been sparring?
must they not have been sparring?