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 couldn't scribble
you couldn't scribble
she couldn't scribble
we couldn't scribble
you couldn't scribble
they couldn't scribble 	I couldn't be scribbling
you couldn't be scribbling
she couldn't be scribbling
we couldn't be scribbling
you couldn't be scribbling
they couldn't be scribbling	I couldn't have scribbled
you couldn't have scribbled
she couldn't have scribbled
we couldn't have scribbled
you couldn't have scribbled
they couldn't have scribbled	I couldn't have been scribbling
you couldn't have been scribbling
she couldn't have been scribbling
we couldn't have been scribbling
you couldn't have been scribbling
they couldn't 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 	
couldn't I scribble?
couldn't you scribble?
couldn't she scribble?
couldn't we scribble?
couldn't you scribble?
couldn't they scribble? 	couldn't I be scribbling?
couldn't you be scribbling?
couldn't she be scribbling?
couldn't we be scribbling?
couldn't you be scribbling?
couldn't they be scribbling? 	couldn't I have scribbled?
couldn't you have scribbled?
couldn't she have scribbled?
couldn't we have scribbled?
couldn't you have scribbled?
couldn't they have scribbled? 	couldn't I have been scribbling?
couldn't you have been scribbling?
couldn't she have been scribbling?
couldn't we have been scribbling?
couldn't you have been scribbling?
couldn't they have been scribbling?