could prosper
Regular verb: prosper - prospered- prospered

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