Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could weld weld you could weld weld he could weld weld we could weld weld you could weld weld they could weld weld
V-ing form
I could be weld welding you could be weld welding he could be weld welding we could be weld welding you could be weld welding they could be weld welding
Perfect
I could have weld welded you could have weld welded he could have weld welded we could have weld welded you could have weld welded they could have weld welded
V-ing perfect
I could have been weld welding you could have been weld welding he could have been weld welding we could have been weld welding you could have been weld welding they could have been weld welding
Negation
Simple form
I could not weld weld you could not weld weld he could not weld weld we could not weld weld you could not weld weld they could not weld weld
V-ing form
I could not be weld welding you could not be weld welding he could not be weld welding we could not be weld welding you could not be weld welding they could not be weld welding
Perfect
I could not have weld welded you could not have weld welded he could not have weld welded we could not have weld welded you could not have weld welded they could not have weld welded
V-ing perfect
I could not have been weld welding you could not have been weld welding he could not have been weld welding we could not have been weld welding you could not have been weld welding they could not have been weld welding
Interrogative form
Simple form
could I weld weld? could you weld weld? could he weld weld? could we weld weld? could you weld weld? could they weld weld?
V-ing form
could I be weld welding? could you be weld welding? could he be weld welding? could we be weld welding? could you be weld welding? could they be weld welding?
Perfect
could I have weld welded? could you have weld welded? could he have weld welded? could we have weld welded? could you have weld welded? could they have weld welded?
V-ing perfect
could I have been weld welding? could you have been weld welding? could he have been weld welding? could we have been weld welding? could you have been weld welding? could they have been weld welding?
Interro-negative form
Simple form
could I not weld weld? could you not weld weld? could he not weld weld? could we not weld weld? could you not weld weld? could they not weld weld?
V-ing form
could I not be weld welding? could you not be weld welding? could he not be weld welding? could we not be weld welding? could you not be weld welding? could they not be weld welding?
Perfect
could I not have weld welded? could you not have weld welded? could he not have weld welded? could we not have weld welded? could you not have weld welded? could they not have weld welded?
V-ing perfect
could I not have been weld welding? could you not have been weld welding? could he not have been weld welding? could we not have been weld welding? could you not have been weld welding? could they not have been weld welding?