could scumble
Regular verb: scumble - scumbled- scumbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scumble
you could scumble
she could scumble
we could scumble
you could scumble
they could scumble 	I could be scumbling
you could be scumbling
she could be scumbling
we could be scumbling
you could be scumbling
they could be scumbling	I could have scumbled
you could have scumbled
she could have scumbled
we could have scumbled
you could have scumbled
they could have scumbled	I could have been scumbling
you could have been scumbling
she could have been scumbling
we could have been scumbling
you could have been scumbling
they could have been scumbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not scumble
you could not scumble
she could not scumble
we could not scumble
you could not scumble
they could not scumble 	I could not be scumbling
you could not be scumbling
she could not be scumbling
we could not be scumbling
you could not be scumbling
they could not be scumbling	I could not have scumbled
you could not have scumbled
she could not have scumbled
we could not have scumbled
you could not have scumbled
they could not have scumbled	I could not have been scumbling
you could not have been scumbling
she could not have been scumbling
we could not have been scumbling
you could not have been scumbling
they could not have been scumbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scumble?
could you scumble?
could she scumble?
could we scumble?
could you scumble?
could they scumble? 	could I be scumbling?
could you be scumbling?
could she be scumbling?
could we be scumbling?
could you be scumbling?
could they be scumbling? 	could I have scumbled?
could you have scumbled?
could she have scumbled?
could we have scumbled?
could you have scumbled?
could they have scumbled? 	could I have been scumbling?
could you have been scumbling?
could she have been scumbling?
could we have been scumbling?
could you have been scumbling?
could they have been scumbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not scumble?
could you not scumble?
could she not scumble?
could we not scumble?
could you not scumble?
could they not scumble? 	could I not be scumbling?
could you not be scumbling?
could she not be scumbling?
could we not be scumbling?
could you not be scumbling?
could they not be scumbling? 	could I not have scumbled?
could you not have scumbled?
could she not have scumbled?
could we not have scumbled?
could you not have scumbled?
could they not have scumbled? 	could I not have been scumbling?
could you not have been scumbling?
could she not have been scumbling?
could we not have been scumbling?
could you not have been scumbling?
could they not have been scumbling?