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 mustn't spar
you mustn't spar
she 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
she mustn't be sparring
we mustn't be sparring
you mustn't be sparring
they mustn't be sparring	I mustn't have sparred
you mustn't have sparred
she 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
she 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 	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 	
mustn't I spar?
mustn't you spar?
mustn't she 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 she be sparring?
mustn't we be sparring?
mustn't you be sparring?
mustn't they be sparring? 	mustn't I have sparred?
mustn't you have sparred?
mustn't she 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 she have been sparring?
mustn't we have been sparring?
mustn't you have been sparring?
mustn't they have been sparring?