English verb conjugation
COULD DECLINE

Regular verb: decline - declined - declined

Affirmation

Simple form	V-ing form
I could decline you could decline he could decline we could decline you could decline they could decline	I could be declining you could be declining he could be declining we could be declining you could be declining they could be declining
Perfect	V-ing perfect
I could have declined you could have declined he could have declined we could have declined you could have declined they could have declined	I could have been declining you could have been declining he could have been declining we could have been declining you could have been declining they could have been declining

Negation

Simple form	V-ing form
I couldn't decline you couldn't decline he couldn't decline we couldn't decline you couldn't decline they couldn't decline	I couldn't be declining you couldn't be declining he couldn't be declining we couldn't be declining you couldn't be declining they couldn't be declining
Perfect	V-ing perfect
I couldn't have declined you couldn't have declined he couldn't have declined we couldn't have declined you couldn't have declined they couldn't have declined	I couldn't have been declining you couldn't have been declining he couldn't have been declining we couldn't have been declining you couldn't have been declining they couldn't have been declining

Interrogative form

Simple form	V-ing form
could I decline? could you decline? could he decline? could we decline? could you decline? could they decline?	could I be declining? could you be declining? could he be declining? could we be declining? could you be declining? could they be declining?
Perfect	V-ing perfect
could I have declined? could you have declined? could he have declined? could we have declined? could you have declined? could they have declined?	could I have been declining? could you have been declining? could he have been declining? could we have been declining? could you have been declining? could they have been declining?

Interro-negative form

Simple form	V-ing form
couldn't I decline? couldn't you decline? couldn't he decline? couldn't we decline? couldn't you decline? couldn't they decline?	couldn't I be declining? couldn't you be declining? couldn't he be declining? couldn't we be declining? couldn't you be declining? couldn't they be declining?
Perfect	V-ing perfect
couldn't I have declined? couldn't you have declined? couldn't he have declined? couldn't we have declined? couldn't you have declined? couldn't they have declined?	couldn't I have been declining? couldn't you have been declining? couldn't he have been declining? couldn't we have been declining? couldn't you have been declining? couldn't they have been declining?