English verb conjugation
COULD SINK

Irregular verb: sink - sank, sunk - sunk

Affirmation

Simple form	V-ing form
I could sink you could sink she could sink we could sink you could sink they could sink	I could be sinking you could be sinking she could be sinking we could be sinking you could be sinking they could be sinking
Perfect	V-ing perfect
I could have sunk you could have sunk she could have sunk we could have sunk you could have sunk they could have sunk	I could have been sinking you could have been sinking she could have been sinking we could have been sinking you could have been sinking they could have been sinking

Negation

Simple form	V-ing form
I could not sink you could not sink she could not sink we could not sink you could not sink they could not sink	I could not be sinking you could not be sinking she could not be sinking we could not be sinking you could not be sinking they could not be sinking
Perfect	V-ing perfect
I could not have sunk you could not have sunk she could not have sunk we could not have sunk you could not have sunk they could not have sunk	I could not have been sinking you could not have been sinking she could not have been sinking we could not have been sinking you could not have been sinking they could not have been sinking

Interrogative form

Simple form	V-ing form
could I sink? could you sink? could she sink? could we sink? could you sink? could they sink?	could I be sinking? could you be sinking? could she be sinking? could we be sinking? could you be sinking? could they be sinking?
Perfect	V-ing perfect
could I have sunk? could you have sunk? could she have sunk? could we have sunk? could you have sunk? could they have sunk?	could I have been sinking? could you have been sinking? could she have been sinking? could we have been sinking? could you have been sinking? could they have been sinking?

Interro-negative form

Simple form	V-ing form
could I not sink? could you not sink? could she not sink? could we not sink? could you not sink? could they not sink?	could I not be sinking? could you not be sinking? could she not be sinking? could we not be sinking? could you not be sinking? could they not be sinking?
Perfect	V-ing perfect
could I not have sunk? could you not have sunk? could she not have sunk? could we not have sunk? could you not have sunk? could they not have sunk?	could I not have been sinking? could you not have been sinking? could she not have been sinking? could we not have been sinking? could you not have been sinking? could they not have been sinking?