English verb conjugation
COULD WINDMILL

Regular verb: windmill - windmilled - windmilled

Affirmation

Simple form	V-ing form
I could windmill you could windmill she could windmill we could windmill you could windmill they could windmill	I could be windmilling you could be windmilling she could be windmilling we could be windmilling you could be windmilling they could be windmilling
Perfect	V-ing perfect
I could have windmilled you could have windmilled she could have windmilled we could have windmilled you could have windmilled they could have windmilled	I could have been windmilling you could have been windmilling she could have been windmilling we could have been windmilling you could have been windmilling they could have been windmilling

Negation

Simple form	V-ing form
I couldn't windmill you couldn't windmill she couldn't windmill we couldn't windmill you couldn't windmill they couldn't windmill	I couldn't be windmilling you couldn't be windmilling she couldn't be windmilling we couldn't be windmilling you couldn't be windmilling they couldn't be windmilling
Perfect	V-ing perfect
I couldn't have windmilled you couldn't have windmilled she couldn't have windmilled we couldn't have windmilled you couldn't have windmilled they couldn't have windmilled	I couldn't have been windmilling you couldn't have been windmilling she couldn't have been windmilling we couldn't have been windmilling you couldn't have been windmilling they couldn't have been windmilling

Interrogative form

Simple form	V-ing form
could I windmill? could you windmill? could she windmill? could we windmill? could you windmill? could they windmill?	could I be windmilling? could you be windmilling? could she be windmilling? could we be windmilling? could you be windmilling? could they be windmilling?
Perfect	V-ing perfect
could I have windmilled? could you have windmilled? could she have windmilled? could we have windmilled? could you have windmilled? could they have windmilled?	could I have been windmilling? could you have been windmilling? could she have been windmilling? could we have been windmilling? could you have been windmilling? could they have been windmilling?

Interro-negative form

Simple form	V-ing form
couldn't I windmill? couldn't you windmill? couldn't she windmill? couldn't we windmill? couldn't you windmill? couldn't they windmill?	couldn't I be windmilling? couldn't you be windmilling? couldn't she be windmilling? couldn't we be windmilling? couldn't you be windmilling? couldn't they be windmilling?
Perfect	V-ing perfect
couldn't I have windmilled? couldn't you have windmilled? couldn't she have windmilled? couldn't we have windmilled? couldn't you have windmilled? couldn't they have windmilled?	couldn't I have been windmilling? couldn't you have been windmilling? couldn't she have been windmilling? couldn't we have been windmilling? couldn't you have been windmilling? couldn't they have been windmilling?