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