could octuple
Regular verb: octuple - octupled- octupled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could octuple
you could octuple
she could octuple
we could octuple
you could octuple
they could octuple 	I could be octupling
you could be octupling
she could be octupling
we could be octupling
you could be octupling
they could be octupling	I could have octupled
you could have octupled
she could have octupled
we could have octupled
you could have octupled
they could have octupled	I could have been octupling
you could have been octupling
she could have been octupling
we could have been octupling
you could have been octupling
they could have been octupling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not octuple
you could not octuple
she could not octuple
we could not octuple
you could not octuple
they could not octuple 	I could not be octupling
you could not be octupling
she could not be octupling
we could not be octupling
you could not be octupling
they could not be octupling	I could not have octupled
you could not have octupled
she could not have octupled
we could not have octupled
you could not have octupled
they could not have octupled	I could not have been octupling
you could not have been octupling
she could not have been octupling
we could not have been octupling
you could not have been octupling
they could not have been octupling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I octuple?
could you octuple?
could she octuple?
could we octuple?
could you octuple?
could they octuple? 	could I be octupling?
could you be octupling?
could she be octupling?
could we be octupling?
could you be octupling?
could they be octupling? 	could I have octupled?
could you have octupled?
could she have octupled?
could we have octupled?
could you have octupled?
could they have octupled? 	could I have been octupling?
could you have been octupling?
could she have been octupling?
could we have been octupling?
could you have been octupling?
could they have been octupling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not octuple?
could you not octuple?
could she not octuple?
could we not octuple?
could you not octuple?
could they not octuple? 	could I not be octupling?
could you not be octupling?
could she not be octupling?
could we not be octupling?
could you not be octupling?
could they not be octupling? 	could I not have octupled?
could you not have octupled?
could she not have octupled?
could we not have octupled?
could you not have octupled?
could they not have octupled? 	could I not have been octupling?
could you not have been octupling?
could she not have been octupling?
could we not have been octupling?
could you not have been octupling?
could they not have been octupling?