English verb conjugation
COULD DRIFT

Regular verb: drift - drifted - drifted

Affirmation

Simple form	V-ing form
I could drift you could drift he could drift we could drift you could drift they could drift	I could be drifting you could be drifting he could be drifting we could be drifting you could be drifting they could be drifting
Perfect	V-ing perfect
I could have drifted you could have drifted he could have drifted we could have drifted you could have drifted they could have drifted	I could have been drifting you could have been drifting he could have been drifting we could have been drifting you could have been drifting they could have been drifting

Negation

Simple form	V-ing form
I couldn't drift you couldn't drift he couldn't drift we couldn't drift you couldn't drift they couldn't drift	I couldn't be drifting you couldn't be drifting he couldn't be drifting we couldn't be drifting you couldn't be drifting they couldn't be drifting
Perfect	V-ing perfect
I couldn't have drifted you couldn't have drifted he couldn't have drifted we couldn't have drifted you couldn't have drifted they couldn't have drifted	I couldn't have been drifting you couldn't have been drifting he couldn't have been drifting we couldn't have been drifting you couldn't have been drifting they couldn't have been drifting

Interrogative form

Simple form	V-ing form
could I drift? could you drift? could he drift? could we drift? could you drift? could they drift?	could I be drifting? could you be drifting? could he be drifting? could we be drifting? could you be drifting? could they be drifting?
Perfect	V-ing perfect
could I have drifted? could you have drifted? could he have drifted? could we have drifted? could you have drifted? could they have drifted?	could I have been drifting? could you have been drifting? could he have been drifting? could we have been drifting? could you have been drifting? could they have been drifting?

Interro-negative form

Simple form	V-ing form
couldn't I drift? couldn't you drift? couldn't he drift? couldn't we drift? couldn't you drift? couldn't they drift?	couldn't I be drifting? couldn't you be drifting? couldn't he be drifting? couldn't we be drifting? couldn't you be drifting? couldn't they be drifting?
Perfect	V-ing perfect
couldn't I have drifted? couldn't you have drifted? couldn't he have drifted? couldn't we have drifted? couldn't you have drifted? couldn't they have drifted?	couldn't I have been drifting? couldn't you have been drifting? couldn't he have been drifting? couldn't we have been drifting? couldn't you have been drifting? couldn't they have been drifting?