Conjugaison du verbe anglais
COULD RIFF

Verbe régulier : riff - riffed - riffed

Affirmation

Forme simple	Forme en V-ing
I could riff you could riff he could riff we could riff you could riff they could riff	I could be riffing you could be riffing he could be riffing we could be riffing you could be riffing they could be riffing
Perfect	Perfect en V-ing
I could have riffed you could have riffed he could have riffed we could have riffed you could have riffed they could have riffed	I could have been riffing you could have been riffing he could have been riffing we could have been riffing you could have been riffing they could have been riffing

Négation

Forme simple	Forme en V-ing
I couldn't riff you couldn't riff he couldn't riff we couldn't riff you couldn't riff they couldn't riff	I couldn't be riffing you couldn't be riffing he couldn't be riffing we couldn't be riffing you couldn't be riffing they couldn't be riffing
Perfect	Perfect en V-ing
I couldn't have riffed you couldn't have riffed he couldn't have riffed we couldn't have riffed you couldn't have riffed they couldn't have riffed	I couldn't have been riffing you couldn't have been riffing he couldn't have been riffing we couldn't have been riffing you couldn't have been riffing they couldn't have been riffing

Forme interrogative

Forme simple	Forme en V-ing
could I riff? could you riff? could he riff? could we riff? could you riff? could they riff?	could I be riffing? could you be riffing? could he be riffing? could we be riffing? could you be riffing? could they be riffing?
Perfect	Perfect en V-ing
could I have riffed? could you have riffed? could he have riffed? could we have riffed? could you have riffed? could they have riffed?	could I have been riffing? could you have been riffing? could he have been riffing? could we have been riffing? could you have been riffing? could they have been riffing?

Forme interro-négative

Forme simple	Forme en V-ing
couldn't I riff? couldn't you riff? couldn't he riff? couldn't we riff? couldn't you riff? couldn't they riff?	couldn't I be riffing? couldn't you be riffing? couldn't he be riffing? couldn't we be riffing? couldn't you be riffing? couldn't they be riffing?
Perfect	Perfect en V-ing
couldn't I have riffed? couldn't you have riffed? couldn't he have riffed? couldn't we have riffed? couldn't you have riffed? couldn't they have riffed?	couldn't I have been riffing? couldn't you have been riffing? couldn't he have been riffing? couldn't we have been riffing? couldn't you have been riffing? couldn't they have been riffing?