could drift
Regular verb: drift - drifted- drifted

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