could windrow
Regular verb: windrow - windrowed- windrowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could windrow
you could windrow
she could windrow
we could windrow
you could windrow
they could windrow 	I could be windrowing
you could be windrowing
she could be windrowing
we could be windrowing
you could be windrowing
they could be windrowing	I could have windrowed
you could have windrowed
she could have windrowed
we could have windrowed
you could have windrowed
they could have windrowed	I could have been windrowing
you could have been windrowing
she could have been windrowing
we could have been windrowing
you could have been windrowing
they could have been windrowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't windrow
you couldn't windrow
she couldn't windrow
we couldn't windrow
you couldn't windrow
they couldn't windrow 	I couldn't be windrowing
you couldn't be windrowing
she couldn't be windrowing
we couldn't be windrowing
you couldn't be windrowing
they couldn't be windrowing	I couldn't have windrowed
you couldn't have windrowed
she couldn't have windrowed
we couldn't have windrowed
you couldn't have windrowed
they couldn't have windrowed	I couldn't have been windrowing
you couldn't have been windrowing
she couldn't have been windrowing
we couldn't have been windrowing
you couldn't have been windrowing
they couldn't have been windrowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I windrow?
could you windrow?
could she windrow?
could we windrow?
could you windrow?
could they windrow? 	could I be windrowing?
could you be windrowing?
could she be windrowing?
could we be windrowing?
could you be windrowing?
could they be windrowing? 	could I have windrowed?
could you have windrowed?
could she have windrowed?
could we have windrowed?
could you have windrowed?
could they have windrowed? 	could I have been windrowing?
could you have been windrowing?
could she have been windrowing?
could we have been windrowing?
could you have been windrowing?
could they have been windrowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I windrow?
couldn't you windrow?
couldn't she windrow?
couldn't we windrow?
couldn't you windrow?
couldn't they windrow? 	couldn't I be windrowing?
couldn't you be windrowing?
couldn't she be windrowing?
couldn't we be windrowing?
couldn't you be windrowing?
couldn't they be windrowing? 	couldn't I have windrowed?
couldn't you have windrowed?
couldn't she have windrowed?
couldn't we have windrowed?
couldn't you have windrowed?
couldn't they have windrowed? 	couldn't I have been windrowing?
couldn't you have been windrowing?
couldn't she have been windrowing?
couldn't we have been windrowing?
couldn't you have been windrowing?
couldn't they have been windrowing?