I can build you can build he can build we can build you can build they can build
Forma con V-ing
I can be building you can be building he can be building we can be building you can be building they can be building
Perfecto
I can have built you can have built he can have built we can have built you can have built they can have built
Perfecto con V-ing
I can have been building you can have been building he can have been building we can have been building you can have been building they can have been building
Negación
Forma simple
I can't build you can't build he can't build we can't build you can't build they can't build
Forma con V-ing
I can't be building you can't be building he can't be building we can't be building you can't be building they can't be building
Perfecto
I can't have built you can't have built he can't have built we can't have built you can't have built they can't have built
Perfecto con V-ing
I can't have been building you can't have been building he can't have been building we can't have been building you can't have been building they can't have been building
Forma interrogativa
Forma simple
can I build? can you build? can he build? can we build? can you build? can they build?
Forma con V-ing
can I be building? can you be building? can he be building? can we be building? can you be building? can they be building?
Perfecto
can I have built? can you have built? can he have built? can we have built? can you have built? can they have built?
Perfecto con V-ing
can I have been building? can you have been building? can he have been building? can we have been building? can you have been building? can they have been building?
Forma interro-negativa
Forma simple
can't I build? can't you build? can't he build? can't we build? can't you build? can't they build?
Forma con V-ing
can't I be building? can't you be building? can't he be building? can't we be building? can't you be building? can't they be building?
Perfecto
can't I have built? can't you have built? can't he have built? can't we have built? can't you have built? can't they have built?
Perfecto con V-ing
can't I have been building? can't you have been building? can't he have been building? can't we have been building? can't you have been building? can't they have been building?