could fribble
Regular verb: fribble - fribbled- fribbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fribble
you could fribble
she could fribble
we could fribble
you could fribble
they could fribble 	I could be fribbling
you could be fribbling
she could be fribbling
we could be fribbling
you could be fribbling
they could be fribbling	I could have fribbled
you could have fribbled
she could have fribbled
we could have fribbled
you could have fribbled
they could have fribbled	I could have been fribbling
you could have been fribbling
she could have been fribbling
we could have been fribbling
you could have been fribbling
they could have been fribbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't fribble
you couldn't fribble
she couldn't fribble
we couldn't fribble
you couldn't fribble
they couldn't fribble 	I couldn't be fribbling
you couldn't be fribbling
she couldn't be fribbling
we couldn't be fribbling
you couldn't be fribbling
they couldn't be fribbling	I couldn't have fribbled
you couldn't have fribbled
she couldn't have fribbled
we couldn't have fribbled
you couldn't have fribbled
they couldn't have fribbled	I couldn't have been fribbling
you couldn't have been fribbling
she couldn't have been fribbling
we couldn't have been fribbling
you couldn't have been fribbling
they couldn't have been fribbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fribble?
could you fribble?
could she fribble?
could we fribble?
could you fribble?
could they fribble? 	could I be fribbling?
could you be fribbling?
could she be fribbling?
could we be fribbling?
could you be fribbling?
could they be fribbling? 	could I have fribbled?
could you have fribbled?
could she have fribbled?
could we have fribbled?
could you have fribbled?
could they have fribbled? 	could I have been fribbling?
could you have been fribbling?
could she have been fribbling?
could we have been fribbling?
could you have been fribbling?
could they have been fribbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I fribble?
couldn't you fribble?
couldn't she fribble?
couldn't we fribble?
couldn't you fribble?
couldn't they fribble? 	couldn't I be fribbling?
couldn't you be fribbling?
couldn't she be fribbling?
couldn't we be fribbling?
couldn't you be fribbling?
couldn't they be fribbling? 	couldn't I have fribbled?
couldn't you have fribbled?
couldn't she have fribbled?
couldn't we have fribbled?
couldn't you have fribbled?
couldn't they have fribbled? 	couldn't I have been fribbling?
couldn't you have been fribbling?
couldn't she have been fribbling?
couldn't we have been fribbling?
couldn't you have been fribbling?
couldn't they have been fribbling?