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 could not fribble you could not fribble he could not fribble we could not fribble you could not fribble they could not fribble	I could not be fribbling you could not be fribbling he could not be fribbling we could not be fribbling you could not be fribbling they could not be fribbling
Perfect	V-ing perfect
I could not have fribbled you could not have fribbled he could not have fribbled we could not have fribbled you could not have fribbled they could not have fribbled	I could not have been fribbling you could not have been fribbling he could not have been fribbling we could not have been fribbling you could not have been fribbling they could not 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
could I not fribble? could you not fribble? could he not fribble? could we not fribble? could you not fribble? could they not fribble?	could I not be fribbling? could you not be fribbling? could he not be fribbling? could we not be fribbling? could you not be fribbling? could they not be fribbling?
Perfect	V-ing perfect
could I not have fribbled? could you not have fribbled? could he not have fribbled? could we not have fribbled? could you not have fribbled? could they not have fribbled?	could I not have been fribbling? could you not have been fribbling? could he not have been fribbling? could we not have been fribbling? could you not have been fribbling? could they not have been fribbling?