can referee
Regular verb: referee - refereed- refereed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can referee
you can referee
she can referee
we can referee
you can referee
they can referee 	I can be refereeing
you can be refereeing
she can be refereeing
we can be refereeing
you can be refereeing
they can be refereeing	I can have refereed
you can have refereed
she can have refereed
we can have refereed
you can have refereed
they can have refereed	I can have been refereeing
you can have been refereeing
she can have been refereeing
we can have been refereeing
you can have been refereeing
they can have been refereeing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't referee
you can't referee
she can't referee
we can't referee
you can't referee
they can't referee 	I can't be refereeing
you can't be refereeing
she can't be refereeing
we can't be refereeing
you can't be refereeing
they can't be refereeing	I can't have refereed
you can't have refereed
she can't have refereed
we can't have refereed
you can't have refereed
they can't have refereed	I can't have been refereeing
you can't have been refereeing
she can't have been refereeing
we can't have been refereeing
you can't have been refereeing
they can't have been refereeing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I referee?
can you referee?
can she referee?
can we referee?
can you referee?
can they referee? 	can I be refereeing?
can you be refereeing?
can she be refereeing?
can we be refereeing?
can you be refereeing?
can they be refereeing? 	can I have refereed?
can you have refereed?
can she have refereed?
can we have refereed?
can you have refereed?
can they have refereed? 	can I have been refereeing?
can you have been refereeing?
can she have been refereeing?
can we have been refereeing?
can you have been refereeing?
can they have been refereeing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I referee?
can't you referee?
can't she referee?
can't we referee?
can't you referee?
can't they referee? 	can't I be refereeing?
can't you be refereeing?
can't she be refereeing?
can't we be refereeing?
can't you be refereeing?
can't they be refereeing? 	can't I have refereed?
can't you have refereed?
can't she have refereed?
can't we have refereed?
can't you have refereed?
can't they have refereed? 	can't I have been refereeing?
can't you have been refereeing?
can't she have been refereeing?
can't we have been refereeing?
can't you have been refereeing?
can't they have been refereeing?