I can weld you can weld he can weld we can weld you can weld they can weld
Forma com V-ing
I can be welding you can be welding he can be welding we can be welding you can be welding they can be welding
Perfeito
I can have welded you can have welded he can have welded we can have welded you can have welded they can have welded
Perfeito com V-ing
I can have been welding you can have been welding he can have been welding we can have been welding you can have been welding they can have been welding
Negação
Forma simple
I can't weld you can't weld he can't weld we can't weld you can't weld they can't weld
Forma com V-ing
I can't be welding you can't be welding he can't be welding we can't be welding you can't be welding they can't be welding
Perfeito
I can't have welded you can't have welded he can't have welded we can't have welded you can't have welded they can't have welded
Perfeito com V-ing
I can't have been welding you can't have been welding he can't have been welding we can't have been welding you can't have been welding they can't have been welding
Forma interrogativa
Forma simple
can I weld? can you weld? can he weld? can we weld? can you weld? can they weld?
Forma com V-ing
can I be welding? can you be welding? can he be welding? can we be welding? can you be welding? can they be welding?
Perfeito
can I have welded? can you have welded? can he have welded? can we have welded? can you have welded? can they have welded?
Perfeito com V-ing
can I have been welding? can you have been welding? can he have been welding? can we have been welding? can you have been welding? can they have been welding?
Forma interro-Negação
Forma simple
can't I weld? can't you weld? can't he weld? can't we weld? can't you weld? can't they weld?
Forma com V-ing
can't I be welding? can't you be welding? can't he be welding? can't we be welding? can't you be welding? can't they be welding?
Perfeito
can't I have welded? can't you have welded? can't he have welded? can't we have welded? can't you have welded? can't they have welded?
Perfeito com V-ing
can't I have been welding? can't you have been welding? can't he have been welding? can't we have been welding? can't you have been welding? can't they have been welding?