I can surface you can surface he can surface we can surface you can surface they can surface
V-ing form
I can be surfacing you can be surfacing he can be surfacing we can be surfacing you can be surfacing they can be surfacing
Perfect
I can have surfaced you can have surfaced he can have surfaced we can have surfaced you can have surfaced they can have surfaced
V-ing perfect
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
Negation
Simple form
I cannot surface you cannot surface he cannot surface we cannot surface you cannot surface they cannot surface
V-ing form
I cannot be surfacing you cannot be surfacing he cannot be surfacing we cannot be surfacing you cannot be surfacing they cannot be surfacing
Perfect
I cannot have surfaced you cannot have surfaced he cannot have surfaced we cannot have surfaced you cannot have surfaced they cannot have surfaced
V-ing perfect
I cannot have been surfacing you cannot have been surfacing he cannot have been surfacing we cannot have been surfacing you cannot have been surfacing they cannot have been surfacing
Interrogative form
Simple form
can I surface? can you surface? can he surface? can we surface? can you surface? can they surface?
V-ing form
can I be surfacing? can you be surfacing? can he be surfacing? can we be surfacing? can you be surfacing? can they be surfacing?
Perfect
can I have surfaced? can you have surfaced? can he have surfaced? can we have surfaced? can you have surfaced? can they have surfaced?
V-ing perfect
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?
Interro-negative form
Simple form
can I not surface? can you not surface? can he not surface? can we not surface? can you not surface? can they not surface?
V-ing form
can I not be surfacing? can you not be surfacing? can he not be surfacing? can we not be surfacing? can you not be surfacing? can they not be surfacing?
Perfect
can I not have surfaced? can you not have surfaced? can he not have surfaced? can we not have surfaced? can you not have surfaced? can they not have surfaced?
V-ing perfect
can I not have been surfacing? can you not have been surfacing? can he not have been surfacing? can we not have been surfacing? can you not have been surfacing? can they not have been surfacing?