English verb conjugation
COULD PROSPER

Regular verb: prosper - prospered - prospered

Affirmation

Simple form	V-ing form
I could prosper you could prosper she could prosper we could prosper you could prosper they could prosper	I could be prospering you could be prospering she could be prospering we could be prospering you could be prospering they could be prospering
Perfect	V-ing perfect
I could have prospered you could have prospered she could have prospered we could have prospered you could have prospered they could have prospered	I could have been prospering you could have been prospering she could have been prospering we could have been prospering you could have been prospering they could have been prospering

Negation

Simple form	V-ing form
I couldn't prosper you couldn't prosper she couldn't prosper we couldn't prosper you couldn't prosper they couldn't prosper	I couldn't be prospering you couldn't be prospering she couldn't be prospering we couldn't be prospering you couldn't be prospering they couldn't be prospering
Perfect	V-ing perfect
I couldn't have prospered you couldn't have prospered she couldn't have prospered we couldn't have prospered you couldn't have prospered they couldn't have prospered	I couldn't have been prospering you couldn't have been prospering she couldn't have been prospering we couldn't have been prospering you couldn't have been prospering they couldn't have been prospering

Interrogative form

Simple form	V-ing form
could I prosper? could you prosper? could she prosper? could we prosper? could you prosper? could they prosper?	could I be prospering? could you be prospering? could she be prospering? could we be prospering? could you be prospering? could they be prospering?
Perfect	V-ing perfect
could I have prospered? could you have prospered? could she have prospered? could we have prospered? could you have prospered? could they have prospered?	could I have been prospering? could you have been prospering? could she have been prospering? could we have been prospering? could you have been prospering? could they have been prospering?

Interro-negative form

Simple form	V-ing form
couldn't I prosper? couldn't you prosper? couldn't she prosper? couldn't we prosper? couldn't you prosper? couldn't they prosper?	couldn't I be prospering? couldn't you be prospering? couldn't she be prospering? couldn't we be prospering? couldn't you be prospering? couldn't they be prospering?
Perfect	V-ing perfect
couldn't I have prospered? couldn't you have prospered? couldn't she have prospered? couldn't we have prospered? couldn't you have prospered? couldn't they have prospered?	couldn't I have been prospering? couldn't you have been prospering? couldn't she have been prospering? couldn't we have been prospering? couldn't you have been prospering? couldn't they have been prospering?