English verb conjugation
COULD FRIBBLE

Regular verb: fribble - fribbled - fribbled

Affirmation

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