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