I can surface you can surface he can surface we can surface you can surface they can surface
Forma com V-ing
I can be surfacing you can be surfacing he can be surfacing we can be surfacing you can be surfacing they can be surfacing
Perfeito
I can have surfaced you can have surfaced he can have surfaced we can have surfaced you can have surfaced they can have surfaced
Perfeito com V-ing
I can have been surfacing you can have been surfacing he can have been surfacing we can have been surfacing you can have been surfacing they can have been surfacing
Negação
Forma simple
I can't surface you can't surface he can't surface we can't surface you can't surface they can't surface
Forma com V-ing
I can't be surfacing you can't be surfacing he can't be surfacing we can't be surfacing you can't be surfacing they can't be surfacing
Perfeito
I can't have surfaced you can't have surfaced he can't have surfaced we can't have surfaced you can't have surfaced they can't have surfaced
Perfeito com V-ing
I can't have been surfacing you can't have been surfacing he can't have been surfacing we can't have been surfacing you can't have been surfacing they can't have been surfacing
Forma interrogativa
Forma simple
can I surface? can you surface? can he surface? can we surface? can you surface? can they surface?
Forma com V-ing
can I be surfacing? can you be surfacing? can he be surfacing? can we be surfacing? can you be surfacing? can they be surfacing?
Perfeito
can I have surfaced? can you have surfaced? can he have surfaced? can we have surfaced? can you have surfaced? can they have surfaced?
Perfeito com V-ing
can I have been surfacing? can you have been surfacing? can he have been surfacing? can we have been surfacing? can you have been surfacing? can they have been surfacing?
Forma interro-Negação
Forma simple
can't I surface? can't you surface? can't he surface? can't we surface? can't you surface? can't they surface?
Forma com V-ing
can't I be surfacing? can't you be surfacing? can't he be surfacing? can't we be surfacing? can't you be surfacing? can't they be surfacing?
Perfeito
can't I have surfaced? can't you have surfaced? can't he have surfaced? can't we have surfaced? can't you have surfaced? can't they have surfaced?
Perfeito com V-ing
can't I have been surfacing? can't you have been surfacing? can't he have been surfacing? can't we have been surfacing? can't you have been surfacing? can't they have been surfacing?