English verb conjugation
COULD GRABBLE

Regular verb: grabble - grabbled - grabbled

Affirmation

Simple form	V-ing form
I could grabble you could grabble he could grabble we could grabble you could grabble they could grabble	I could be grabbling you could be grabbling he could be grabbling we could be grabbling you could be grabbling they could be grabbling
Perfect	V-ing perfect
I could have grabbled you could have grabbled he could have grabbled we could have grabbled you could have grabbled they could have grabbled	I could have been grabbling you could have been grabbling he could have been grabbling we could have been grabbling you could have been grabbling they could have been grabbling

Negation

Simple form	V-ing form
I could not grabble you could not grabble he could not grabble we could not grabble you could not grabble they could not grabble	I could not be grabbling you could not be grabbling he could not be grabbling we could not be grabbling you could not be grabbling they could not be grabbling
Perfect	V-ing perfect
I could not have grabbled you could not have grabbled he could not have grabbled we could not have grabbled you could not have grabbled they could not have grabbled	I could not have been grabbling you could not have been grabbling he could not have been grabbling we could not have been grabbling you could not have been grabbling they could not have been grabbling

Interrogative form

Simple form	V-ing form
could I grabble? could you grabble? could he grabble? could we grabble? could you grabble? could they grabble?	could I be grabbling? could you be grabbling? could he be grabbling? could we be grabbling? could you be grabbling? could they be grabbling?
Perfect	V-ing perfect
could I have grabbled? could you have grabbled? could he have grabbled? could we have grabbled? could you have grabbled? could they have grabbled?	could I have been grabbling? could you have been grabbling? could he have been grabbling? could we have been grabbling? could you have been grabbling? could they have been grabbling?

Interro-negative form

Simple form	V-ing form
could I not grabble? could you not grabble? could he not grabble? could we not grabble? could you not grabble? could they not grabble?	could I not be grabbling? could you not be grabbling? could he not be grabbling? could we not be grabbling? could you not be grabbling? could they not be grabbling?
Perfect	V-ing perfect
could I not have grabbled? could you not have grabbled? could he not have grabbled? could we not have grabbled? could you not have grabbled? could they not have grabbled?	could I not have been grabbling? could you not have been grabbling? could he not have been grabbling? could we not have been grabbling? could you not have been grabbling? could they not have been grabbling?