English verb conjugation
COULD LEAK

Regular verb: leak - leaked - leaked

Affirmation

Simple form	V-ing form
I could leak you could leak he could leak we could leak you could leak they could leak	I could be leaking you could be leaking he could be leaking we could be leaking you could be leaking they could be leaking
Perfect	V-ing perfect
I could have leaked you could have leaked he could have leaked we could have leaked you could have leaked they could have leaked	I could have been leaking you could have been leaking he could have been leaking we could have been leaking you could have been leaking they could have been leaking

Negation

Simple form	V-ing form
I couldn't leak you couldn't leak he couldn't leak we couldn't leak you couldn't leak they couldn't leak	I couldn't be leaking you couldn't be leaking he couldn't be leaking we couldn't be leaking you couldn't be leaking they couldn't be leaking
Perfect	V-ing perfect
I couldn't have leaked you couldn't have leaked he couldn't have leaked we couldn't have leaked you couldn't have leaked they couldn't have leaked	I couldn't have been leaking you couldn't have been leaking he couldn't have been leaking we couldn't have been leaking you couldn't have been leaking they couldn't have been leaking

Interrogative form

Simple form	V-ing form
could I leak? could you leak? could he leak? could we leak? could you leak? could they leak?	could I be leaking? could you be leaking? could he be leaking? could we be leaking? could you be leaking? could they be leaking?
Perfect	V-ing perfect
could I have leaked? could you have leaked? could he have leaked? could we have leaked? could you have leaked? could they have leaked?	could I have been leaking? could you have been leaking? could he have been leaking? could we have been leaking? could you have been leaking? could they have been leaking?

Interro-negative form

Simple form	V-ing form
couldn't I leak? couldn't you leak? couldn't he leak? couldn't we leak? couldn't you leak? couldn't they leak?	couldn't I be leaking? couldn't you be leaking? couldn't he be leaking? couldn't we be leaking? couldn't you be leaking? couldn't they be leaking?
Perfect	V-ing perfect
couldn't I have leaked? couldn't you have leaked? couldn't he have leaked? couldn't we have leaked? couldn't you have leaked? couldn't they have leaked?	couldn't I have been leaking? couldn't you have been leaking? couldn't he have been leaking? couldn't we have been leaking? couldn't you have been leaking? couldn't they have been leaking?