I could weld you could weld she could weld we could weld you could weld they could weld
Forme en V-ing
I could be welding you could be welding she could be welding we could be welding you could be welding they could be welding
Perfect
I could have welded you could have welded she could have welded we could have welded you could have welded they could have welded
Perfect en V-ing
I could have been welding you could have been welding she could have been welding we could have been welding you could have been welding they could have been welding
Négation
Forme simple
I could not weld you could not weld she could not weld we could not weld you could not weld they could not weld
Forme en V-ing
I could not be welding you could not be welding she could not be welding we could not be welding you could not be welding they could not be welding
Perfect
I could not have welded you could not have welded she could not have welded we could not have welded you could not have welded they could not have welded
Perfect en V-ing
I could not have been welding you could not have been welding she could not have been welding we could not have been welding you could not have been welding they could not have been welding
Forme interrogative
Forme simple
could I weld? could you weld? could she weld? could we weld? could you weld? could they weld?
Forme en V-ing
could I be welding? could you be welding? could she be welding? could we be welding? could you be welding? could they be welding?
Perfect
could I have welded? could you have welded? could she have welded? could we have welded? could you have welded? could they have welded?
Perfect en V-ing
could I have been welding? could you have been welding? could she have been welding? could we have been welding? could you have been welding? could they have been welding?
Forme interro-négative
Forme simple
could I not weld? could you not weld? could she not weld? could we not weld? could you not weld? could they not weld?
Forme en V-ing
could I not be welding? could you not be welding? could she not be welding? could we not be welding? could you not be welding? could they not be welding?
Perfect
could I not have welded? could you not have welded? could she not have welded? could we not have welded? could you not have welded? could they not have welded?
Perfect en V-ing
could I not have been welding? could you not have been welding? could she not have been welding? could we not have been welding? could you not have been welding? could they not have been welding?