English verb conjugation
COULD DISCOLOR

Regular verb: discolor - discolored - discolored

Affirmation

Simple form	V-ing form
I could discolor you could discolor she could discolor we could discolor you could discolor they could discolor	I could be discoloring you could be discoloring she could be discoloring we could be discoloring you could be discoloring they could be discoloring
Perfect	V-ing perfect
I could have discolored you could have discolored she could have discolored we could have discolored you could have discolored they could have discolored	I could have been discoloring you could have been discoloring she could have been discoloring we could have been discoloring you could have been discoloring they could have been discoloring

Negation

Simple form	V-ing form
I couldn't discolor you couldn't discolor she couldn't discolor we couldn't discolor you couldn't discolor they couldn't discolor	I couldn't be discoloring you couldn't be discoloring she couldn't be discoloring we couldn't be discoloring you couldn't be discoloring they couldn't be discoloring
Perfect	V-ing perfect
I couldn't have discolored you couldn't have discolored she couldn't have discolored we couldn't have discolored you couldn't have discolored they couldn't have discolored	I couldn't have been discoloring you couldn't have been discoloring she couldn't have been discoloring we couldn't have been discoloring you couldn't have been discoloring they couldn't have been discoloring

Interrogative form

Simple form	V-ing form
could I discolor? could you discolor? could she discolor? could we discolor? could you discolor? could they discolor?	could I be discoloring? could you be discoloring? could she be discoloring? could we be discoloring? could you be discoloring? could they be discoloring?
Perfect	V-ing perfect
could I have discolored? could you have discolored? could she have discolored? could we have discolored? could you have discolored? could they have discolored?	could I have been discoloring? could you have been discoloring? could she have been discoloring? could we have been discoloring? could you have been discoloring? could they have been discoloring?

Interro-negative form

Simple form	V-ing form
couldn't I discolor? couldn't you discolor? couldn't she discolor? couldn't we discolor? couldn't you discolor? couldn't they discolor?	couldn't I be discoloring? couldn't you be discoloring? couldn't she be discoloring? couldn't we be discoloring? couldn't you be discoloring? couldn't they be discoloring?
Perfect	V-ing perfect
couldn't I have discolored? couldn't you have discolored? couldn't she have discolored? couldn't we have discolored? couldn't you have discolored? couldn't they have discolored?	couldn't I have been discoloring? couldn't you have been discoloring? couldn't she have been discoloring? couldn't we have been discoloring? couldn't you have been discoloring? couldn't they have been discoloring?