I could solve you could solve he could solve we could solve you could solve they could solve
Forme en V-ing
I could be solving you could be solving he could be solving we could be solving you could be solving they could be solving
Perfect
I could have solved you could have solved he could have solved we could have solved you could have solved they could have solved
Perfect en V-ing
I could have been solving you could have been solving he could have been solving we could have been solving you could have been solving they could have been solving
Négation
Forme simple
I couldn't solve you couldn't solve he couldn't solve we couldn't solve you couldn't solve they couldn't solve
Forme en V-ing
I couldn't be solving you couldn't be solving he couldn't be solving we couldn't be solving you couldn't be solving they couldn't be solving
Perfect
I couldn't have solved you couldn't have solved he couldn't have solved we couldn't have solved you couldn't have solved they couldn't have solved
Perfect en V-ing
I couldn't have been solving you couldn't have been solving he couldn't have been solving we couldn't have been solving you couldn't have been solving they couldn't have been solving
Forme interrogative
Forme simple
could I solve? could you solve? could he solve? could we solve? could you solve? could they solve?
Forme en V-ing
could I be solving? could you be solving? could he be solving? could we be solving? could you be solving? could they be solving?
Perfect
could I have solved? could you have solved? could he have solved? could we have solved? could you have solved? could they have solved?
Perfect en V-ing
could I have been solving? could you have been solving? could he have been solving? could we have been solving? could you have been solving? could they have been solving?
Forme interro-négative
Forme simple
couldn't I solve? couldn't you solve? couldn't he solve? couldn't we solve? couldn't you solve? couldn't they solve?
Forme en V-ing
couldn't I be solving? couldn't you be solving? couldn't he be solving? couldn't we be solving? couldn't you be solving? couldn't they be solving?
Perfect
couldn't I have solved? couldn't you have solved? couldn't he have solved? couldn't we have solved? couldn't you have solved? couldn't they have solved?
Perfect en V-ing
couldn't I have been solving? couldn't you have been solving? couldn't he have been solving? couldn't we have been solving? couldn't you have been solving? couldn't they have been solving?