could celebrate
Regular verb: celebrate - celebrated- celebrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could celebrate
you could celebrate
he could celebrate
we could celebrate
you could celebrate
they could celebrate 	I could be celebrating
you could be celebrating
he could be celebrating
we could be celebrating
you could be celebrating
they could be celebrating	I could have celebrated
you could have celebrated
he could have celebrated
we could have celebrated
you could have celebrated
they could have celebrated	I could have been celebrating
you could have been celebrating
he could have been celebrating
we could have been celebrating
you could have been celebrating
they could have been celebrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not celebrate
you could not celebrate
he could not celebrate
we could not celebrate
you could not celebrate
they could not celebrate 	I could not be celebrating
you could not be celebrating
he could not be celebrating
we could not be celebrating
you could not be celebrating
they could not be celebrating	I could not have celebrated
you could not have celebrated
he could not have celebrated
we could not have celebrated
you could not have celebrated
they could not have celebrated	I could not have been celebrating
you could not have been celebrating
he could not have been celebrating
we could not have been celebrating
you could not have been celebrating
they could not have been celebrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I celebrate?
could you celebrate?
could he celebrate?
could we celebrate?
could you celebrate?
could they celebrate? 	could I be celebrating?
could you be celebrating?
could he be celebrating?
could we be celebrating?
could you be celebrating?
could they be celebrating? 	could I have celebrated?
could you have celebrated?
could he have celebrated?
could we have celebrated?
could you have celebrated?
could they have celebrated? 	could I have been celebrating?
could you have been celebrating?
could he have been celebrating?
could we have been celebrating?
could you have been celebrating?
could they have been celebrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not celebrate?
could you not celebrate?
could he not celebrate?
could we not celebrate?
could you not celebrate?
could they not celebrate? 	could I not be celebrating?
could you not be celebrating?
could he not be celebrating?
could we not be celebrating?
could you not be celebrating?
could they not be celebrating? 	could I not have celebrated?
could you not have celebrated?
could he not have celebrated?
could we not have celebrated?
could you not have celebrated?
could they not have celebrated? 	could I not have been celebrating?
could you not have been celebrating?
could he not have been celebrating?
could we not have been celebrating?
could you not have been celebrating?
could they not have been celebrating?