I can soundproof you can soundproof he can soundproof we can soundproof you can soundproof they can soundproof
V-ing form
I can be soundproofing you can be soundproofing he can be soundproofing we can be soundproofing you can be soundproofing they can be soundproofing
Perfect
I can have soundproofed you can have soundproofed he can have soundproofed we can have soundproofed you can have soundproofed they can have soundproofed
V-ing perfect
I can have been soundproofing you can have been soundproofing he can have been soundproofing we can have been soundproofing you can have been soundproofing they can have been soundproofing
Negation
Simple form
I cannot soundproof you cannot soundproof he cannot soundproof we cannot soundproof you cannot soundproof they cannot soundproof
V-ing form
I cannot be soundproofing you cannot be soundproofing he cannot be soundproofing we cannot be soundproofing you cannot be soundproofing they cannot be soundproofing
Perfect
I cannot have soundproofed you cannot have soundproofed he cannot have soundproofed we cannot have soundproofed you cannot have soundproofed they cannot have soundproofed
V-ing perfect
I cannot have been soundproofing you cannot have been soundproofing he cannot have been soundproofing we cannot have been soundproofing you cannot have been soundproofing they cannot have been soundproofing
Interrogative form
Simple form
can I soundproof? can you soundproof? can he soundproof? can we soundproof? can you soundproof? can they soundproof?
V-ing form
can I be soundproofing? can you be soundproofing? can he be soundproofing? can we be soundproofing? can you be soundproofing? can they be soundproofing?
Perfect
can I have soundproofed? can you have soundproofed? can he have soundproofed? can we have soundproofed? can you have soundproofed? can they have soundproofed?
V-ing perfect
can I have been soundproofing? can you have been soundproofing? can he have been soundproofing? can we have been soundproofing? can you have been soundproofing? can they have been soundproofing?
Interro-negative form
Simple form
can I not soundproof? can you not soundproof? can he not soundproof? can we not soundproof? can you not soundproof? can they not soundproof?
V-ing form
can I not be soundproofing? can you not be soundproofing? can he not be soundproofing? can we not be soundproofing? can you not be soundproofing? can they not be soundproofing?
Perfect
can I not have soundproofed? can you not have soundproofed? can he not have soundproofed? can we not have soundproofed? can you not have soundproofed? can they not have soundproofed?
V-ing perfect
can I not have been soundproofing? can you not have been soundproofing? can he not have been soundproofing? can we not have been soundproofing? can you not have been soundproofing? can they not have been soundproofing?