English verb conjugation
COULD DECK

Regular verb: deck - decked - decked

Affirmation

Simple form	V-ing form
I could deck you could deck he could deck we could deck you could deck they could deck	I could be decking you could be decking he could be decking we could be decking you could be decking they could be decking
Perfect	V-ing perfect
I could have decked you could have decked he could have decked we could have decked you could have decked they could have decked	I could have been decking you could have been decking he could have been decking we could have been decking you could have been decking they could have been decking

Negation

Simple form	V-ing form
I couldn't deck you couldn't deck he couldn't deck we couldn't deck you couldn't deck they couldn't deck	I couldn't be decking you couldn't be decking he couldn't be decking we couldn't be decking you couldn't be decking they couldn't be decking
Perfect	V-ing perfect
I couldn't have decked you couldn't have decked he couldn't have decked we couldn't have decked you couldn't have decked they couldn't have decked	I couldn't have been decking you couldn't have been decking he couldn't have been decking we couldn't have been decking you couldn't have been decking they couldn't have been decking

Interrogative form

Simple form	V-ing form
could I deck? could you deck? could he deck? could we deck? could you deck? could they deck?	could I be decking? could you be decking? could he be decking? could we be decking? could you be decking? could they be decking?
Perfect	V-ing perfect
could I have decked? could you have decked? could he have decked? could we have decked? could you have decked? could they have decked?	could I have been decking? could you have been decking? could he have been decking? could we have been decking? could you have been decking? could they have been decking?

Interro-negative form

Simple form	V-ing form
couldn't I deck? couldn't you deck? couldn't he deck? couldn't we deck? couldn't you deck? couldn't they deck?	couldn't I be decking? couldn't you be decking? couldn't he be decking? couldn't we be decking? couldn't you be decking? couldn't they be decking?
Perfect	V-ing perfect
couldn't I have decked? couldn't you have decked? couldn't he have decked? couldn't we have decked? couldn't you have decked? couldn't they have decked?	couldn't I have been decking? couldn't you have been decking? couldn't he have been decking? couldn't we have been decking? couldn't you have been decking? couldn't they have been decking?