could scribble
Regular verb: scribble - scribbled- scribbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scribble
you could scribble
she could scribble
we could scribble
you could scribble
they could scribble 	I could be scribbling
you could be scribbling
she could be scribbling
we could be scribbling
you could be scribbling
they could be scribbling	I could have scribbled
you could have scribbled
she could have scribbled
we could have scribbled
you could have scribbled
they could have scribbled	I could have been scribbling
you could have been scribbling
she could have been scribbling
we could have been scribbling
you could have been scribbling
they could have been scribbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not scribble
you could not scribble
she could not scribble
we could not scribble
you could not scribble
they could not scribble 	I could not be scribbling
you could not be scribbling
she could not be scribbling
we could not be scribbling
you could not be scribbling
they could not be scribbling	I could not have scribbled
you could not have scribbled
she could not have scribbled
we could not have scribbled
you could not have scribbled
they could not have scribbled	I could not have been scribbling
you could not have been scribbling
she could not have been scribbling
we could not have been scribbling
you could not have been scribbling
they could not have been scribbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scribble?
could you scribble?
could she scribble?
could we scribble?
could you scribble?
could they scribble? 	could I be scribbling?
could you be scribbling?
could she be scribbling?
could we be scribbling?
could you be scribbling?
could they be scribbling? 	could I have scribbled?
could you have scribbled?
could she have scribbled?
could we have scribbled?
could you have scribbled?
could they have scribbled? 	could I have been scribbling?
could you have been scribbling?
could she have been scribbling?
could we have been scribbling?
could you have been scribbling?
could they have been scribbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not scribble?
could you not scribble?
could she not scribble?
could we not scribble?
could you not scribble?
could they not scribble? 	could I not be scribbling?
could you not be scribbling?
could she not be scribbling?
could we not be scribbling?
could you not be scribbling?
could they not be scribbling? 	could I not have scribbled?
could you not have scribbled?
could she not have scribbled?
could we not have scribbled?
could you not have scribbled?
could they not have scribbled? 	could I not have been scribbling?
could you not have been scribbling?
could she not have been scribbling?
could we not have been scribbling?
could you not have been scribbling?
could they not have been scribbling?