I can unmask you can unmask she can unmask we can unmask you can unmask they can unmask
V-ing form
I can be unmasking you can be unmasking she can be unmasking we can be unmasking you can be unmasking they can be unmasking
Perfect
I can have unmasked you can have unmasked she can have unmasked we can have unmasked you can have unmasked they can have unmasked
V-ing perfect
I can have been unmasking you can have been unmasking she can have been unmasking we can have been unmasking you can have been unmasking they can have been unmasking
Negation
Simple form
I cannot unmask you cannot unmask she cannot unmask we cannot unmask you cannot unmask they cannot unmask
V-ing form
I cannot be unmasking you cannot be unmasking she cannot be unmasking we cannot be unmasking you cannot be unmasking they cannot be unmasking
Perfect
I cannot have unmasked you cannot have unmasked she cannot have unmasked we cannot have unmasked you cannot have unmasked they cannot have unmasked
V-ing perfect
I cannot have been unmasking you cannot have been unmasking she cannot have been unmasking we cannot have been unmasking you cannot have been unmasking they cannot have been unmasking
Interrogative form
Simple form
can I unmask? can you unmask? can she unmask? can we unmask? can you unmask? can they unmask?
V-ing form
can I be unmasking? can you be unmasking? can she be unmasking? can we be unmasking? can you be unmasking? can they be unmasking?
Perfect
can I have unmasked? can you have unmasked? can she have unmasked? can we have unmasked? can you have unmasked? can they have unmasked?
V-ing perfect
can I have been unmasking? can you have been unmasking? can she have been unmasking? can we have been unmasking? can you have been unmasking? can they have been unmasking?
Interro-negative form
Simple form
can I not unmask? can you not unmask? can she not unmask? can we not unmask? can you not unmask? can they not unmask?
V-ing form
can I not be unmasking? can you not be unmasking? can she not be unmasking? can we not be unmasking? can you not be unmasking? can they not be unmasking?
Perfect
can I not have unmasked? can you not have unmasked? can she not have unmasked? can we not have unmasked? can you not have unmasked? can they not have unmasked?
V-ing perfect
can I not have been unmasking? can you not have been unmasking? can she not have been unmasking? can we not have been unmasking? can you not have been unmasking? can they not have been unmasking?