English verb conjugation
COULD RETIRE

Regular verb: retire - retired - retired

Affirmation

Simple form	V-ing form
I could retire you could retire she could retire we could retire you could retire they could retire	I could be retiring you could be retiring she could be retiring we could be retiring you could be retiring they could be retiring
Perfect	V-ing perfect
I could have retired you could have retired she could have retired we could have retired you could have retired they could have retired	I could have been retiring you could have been retiring she could have been retiring we could have been retiring you could have been retiring they could have been retiring

Negation

Simple form	V-ing form
I couldn't retire you couldn't retire she couldn't retire we couldn't retire you couldn't retire they couldn't retire	I couldn't be retiring you couldn't be retiring she couldn't be retiring we couldn't be retiring you couldn't be retiring they couldn't be retiring
Perfect	V-ing perfect
I couldn't have retired you couldn't have retired she couldn't have retired we couldn't have retired you couldn't have retired they couldn't have retired	I couldn't have been retiring you couldn't have been retiring she couldn't have been retiring we couldn't have been retiring you couldn't have been retiring they couldn't have been retiring

Interrogative form

Simple form	V-ing form
could I retire? could you retire? could she retire? could we retire? could you retire? could they retire?	could I be retiring? could you be retiring? could she be retiring? could we be retiring? could you be retiring? could they be retiring?
Perfect	V-ing perfect
could I have retired? could you have retired? could she have retired? could we have retired? could you have retired? could they have retired?	could I have been retiring? could you have been retiring? could she have been retiring? could we have been retiring? could you have been retiring? could they have been retiring?

Interro-negative form

Simple form	V-ing form
couldn't I retire? couldn't you retire? couldn't she retire? couldn't we retire? couldn't you retire? couldn't they retire?	couldn't I be retiring? couldn't you be retiring? couldn't she be retiring? couldn't we be retiring? couldn't you be retiring? couldn't they be retiring?
Perfect	V-ing perfect
couldn't I have retired? couldn't you have retired? couldn't she have retired? couldn't we have retired? couldn't you have retired? couldn't they have retired?	couldn't I have been retiring? couldn't you have been retiring? couldn't she have been retiring? couldn't we have been retiring? couldn't you have been retiring? couldn't they have been retiring?