English verb conjugation
COULD HAMMER

Regular verb: hammer - hammered - hammered

Affirmation

Simple form	V-ing form
I could hammer you could hammer she could hammer we could hammer you could hammer they could hammer	I could be hammering you could be hammering she could be hammering we could be hammering you could be hammering they could be hammering
Perfect	V-ing perfect
I could have hammered you could have hammered she could have hammered we could have hammered you could have hammered they could have hammered	I could have been hammering you could have been hammering she could have been hammering we could have been hammering you could have been hammering they could have been hammering

Negation

Simple form	V-ing form
I couldn't hammer you couldn't hammer she couldn't hammer we couldn't hammer you couldn't hammer they couldn't hammer	I couldn't be hammering you couldn't be hammering she couldn't be hammering we couldn't be hammering you couldn't be hammering they couldn't be hammering
Perfect	V-ing perfect
I couldn't have hammered you couldn't have hammered she couldn't have hammered we couldn't have hammered you couldn't have hammered they couldn't have hammered	I couldn't have been hammering you couldn't have been hammering she couldn't have been hammering we couldn't have been hammering you couldn't have been hammering they couldn't have been hammering

Interrogative form

Simple form	V-ing form
could I hammer? could you hammer? could she hammer? could we hammer? could you hammer? could they hammer?	could I be hammering? could you be hammering? could she be hammering? could we be hammering? could you be hammering? could they be hammering?
Perfect	V-ing perfect
could I have hammered? could you have hammered? could she have hammered? could we have hammered? could you have hammered? could they have hammered?	could I have been hammering? could you have been hammering? could she have been hammering? could we have been hammering? could you have been hammering? could they have been hammering?

Interro-negative form

Simple form	V-ing form
couldn't I hammer? couldn't you hammer? couldn't she hammer? couldn't we hammer? couldn't you hammer? couldn't they hammer?	couldn't I be hammering? couldn't you be hammering? couldn't she be hammering? couldn't we be hammering? couldn't you be hammering? couldn't they be hammering?
Perfect	V-ing perfect
couldn't I have hammered? couldn't you have hammered? couldn't she have hammered? couldn't we have hammered? couldn't you have hammered? couldn't they have hammered?	couldn't I have been hammering? couldn't you have been hammering? couldn't she have been hammering? couldn't we have been hammering? couldn't you have been hammering? couldn't they have been hammering?