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 couldn't scumble
you couldn't scumble
she couldn't scumble
we couldn't scumble
you couldn't scumble
they couldn't scumble 	I couldn't be scumbling
you couldn't be scumbling
she couldn't be scumbling
we couldn't be scumbling
you couldn't be scumbling
they couldn't be scumbling	I couldn't have scumbled
you couldn't have scumbled
she couldn't have scumbled
we couldn't have scumbled
you couldn't have scumbled
they couldn't have scumbled	I couldn't have been scumbling
you couldn't have been scumbling
she couldn't have been scumbling
we couldn't have been scumbling
you couldn't have been scumbling
they couldn't 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 	
couldn't I scumble?
couldn't you scumble?
couldn't she scumble?
couldn't we scumble?
couldn't you scumble?
couldn't they scumble? 	couldn't I be scumbling?
couldn't you be scumbling?
couldn't she be scumbling?
couldn't we be scumbling?
couldn't you be scumbling?
couldn't they be scumbling? 	couldn't I have scumbled?
couldn't you have scumbled?
couldn't she have scumbled?
couldn't we have scumbled?
couldn't you have scumbled?
couldn't they have scumbled? 	couldn't I have been scumbling?
couldn't you have been scumbling?
couldn't she have been scumbling?
couldn't we have been scumbling?
couldn't you have been scumbling?
couldn't they have been scumbling?