English verb conjugation
COULD NIX

Regular verb: nix - nixed - nixed

Affirmation

Simple form	V-ing form
I could nix you could nix she could nix we could nix you could nix they could nix	I could be nixing you could be nixing she could be nixing we could be nixing you could be nixing they could be nixing
Perfect	V-ing perfect
I could have nixed you could have nixed she could have nixed we could have nixed you could have nixed they could have nixed	I could have been nixing you could have been nixing she could have been nixing we could have been nixing you could have been nixing they could have been nixing

Negation

Simple form	V-ing form
I couldn't nix you couldn't nix she couldn't nix we couldn't nix you couldn't nix they couldn't nix	I couldn't be nixing you couldn't be nixing she couldn't be nixing we couldn't be nixing you couldn't be nixing they couldn't be nixing
Perfect	V-ing perfect
I couldn't have nixed you couldn't have nixed she couldn't have nixed we couldn't have nixed you couldn't have nixed they couldn't have nixed	I couldn't have been nixing you couldn't have been nixing she couldn't have been nixing we couldn't have been nixing you couldn't have been nixing they couldn't have been nixing

Interrogative form

Simple form	V-ing form
could I nix? could you nix? could she nix? could we nix? could you nix? could they nix?	could I be nixing? could you be nixing? could she be nixing? could we be nixing? could you be nixing? could they be nixing?
Perfect	V-ing perfect
could I have nixed? could you have nixed? could she have nixed? could we have nixed? could you have nixed? could they have nixed?	could I have been nixing? could you have been nixing? could she have been nixing? could we have been nixing? could you have been nixing? could they have been nixing?

Interro-negative form

Simple form	V-ing form
couldn't I nix? couldn't you nix? couldn't she nix? couldn't we nix? couldn't you nix? couldn't they nix?	couldn't I be nixing? couldn't you be nixing? couldn't she be nixing? couldn't we be nixing? couldn't you be nixing? couldn't they be nixing?
Perfect	V-ing perfect
couldn't I have nixed? couldn't you have nixed? couldn't she have nixed? couldn't we have nixed? couldn't you have nixed? couldn't they have nixed?	couldn't I have been nixing? couldn't you have been nixing? couldn't she have been nixing? couldn't we have been nixing? couldn't you have been nixing? couldn't they have been nixing?