English verb conjugation
COULD GRAVEL

Regular verb: gravel - gravelled - gravelled

Affirmation

Simple form	V-ing form
I could gravel you could gravel he could gravel we could gravel you could gravel they could gravel	I could be gravelling you could be gravelling he could be gravelling we could be gravelling you could be gravelling they could be gravelling
Perfect	V-ing perfect
I could have gravelled you could have gravelled he could have gravelled we could have gravelled you could have gravelled they could have gravelled	I could have been gravelling you could have been gravelling he could have been gravelling we could have been gravelling you could have been gravelling they could have been gravelling

Negation

Simple form	V-ing form
I couldn't gravel you couldn't gravel he couldn't gravel we couldn't gravel you couldn't gravel they couldn't gravel	I couldn't be gravelling you couldn't be gravelling he couldn't be gravelling we couldn't be gravelling you couldn't be gravelling they couldn't be gravelling
Perfect	V-ing perfect
I couldn't have gravelled you couldn't have gravelled he couldn't have gravelled we couldn't have gravelled you couldn't have gravelled they couldn't have gravelled	I couldn't have been gravelling you couldn't have been gravelling he couldn't have been gravelling we couldn't have been gravelling you couldn't have been gravelling they couldn't have been gravelling

Interrogative form

Simple form	V-ing form
could I gravel? could you gravel? could he gravel? could we gravel? could you gravel? could they gravel?	could I be gravelling? could you be gravelling? could he be gravelling? could we be gravelling? could you be gravelling? could they be gravelling?
Perfect	V-ing perfect
could I have gravelled? could you have gravelled? could he have gravelled? could we have gravelled? could you have gravelled? could they have gravelled?	could I have been gravelling? could you have been gravelling? could he have been gravelling? could we have been gravelling? could you have been gravelling? could they have been gravelling?

Interro-negative form

Simple form	V-ing form
couldn't I gravel? couldn't you gravel? couldn't he gravel? couldn't we gravel? couldn't you gravel? couldn't they gravel?	couldn't I be gravelling? couldn't you be gravelling? couldn't he be gravelling? couldn't we be gravelling? couldn't you be gravelling? couldn't they be gravelling?
Perfect	V-ing perfect
couldn't I have gravelled? couldn't you have gravelled? couldn't he have gravelled? couldn't we have gravelled? couldn't you have gravelled? couldn't they have gravelled?	couldn't I have been gravelling? couldn't you have been gravelling? couldn't he have been gravelling? couldn't we have been gravelling? couldn't you have been gravelling? couldn't they have been gravelling?