I can waterproof you can waterproof he can waterproof we can waterproof you can waterproof they can waterproof
V-ing form
I can be waterproofing you can be waterproofing he can be waterproofing we can be waterproofing you can be waterproofing they can be waterproofing
Perfect
I can have waterproofed you can have waterproofed he can have waterproofed we can have waterproofed you can have waterproofed they can have waterproofed
V-ing perfect
I can have been waterproofing you can have been waterproofing he can have been waterproofing we can have been waterproofing you can have been waterproofing they can have been waterproofing
Negation
Simple form
I cannot waterproof you cannot waterproof he cannot waterproof we cannot waterproof you cannot waterproof they cannot waterproof
V-ing form
I cannot be waterproofing you cannot be waterproofing he cannot be waterproofing we cannot be waterproofing you cannot be waterproofing they cannot be waterproofing
Perfect
I cannot have waterproofed you cannot have waterproofed he cannot have waterproofed we cannot have waterproofed you cannot have waterproofed they cannot have waterproofed
V-ing perfect
I cannot have been waterproofing you cannot have been waterproofing he cannot have been waterproofing we cannot have been waterproofing you cannot have been waterproofing they cannot have been waterproofing
Interrogative form
Simple form
can I waterproof? can you waterproof? can he waterproof? can we waterproof? can you waterproof? can they waterproof?
V-ing form
can I be waterproofing? can you be waterproofing? can he be waterproofing? can we be waterproofing? can you be waterproofing? can they be waterproofing?
Perfect
can I have waterproofed? can you have waterproofed? can he have waterproofed? can we have waterproofed? can you have waterproofed? can they have waterproofed?
V-ing perfect
can I have been waterproofing? can you have been waterproofing? can he have been waterproofing? can we have been waterproofing? can you have been waterproofing? can they have been waterproofing?
Interro-negative form
Simple form
can I not waterproof? can you not waterproof? can he not waterproof? can we not waterproof? can you not waterproof? can they not waterproof?
V-ing form
can I not be waterproofing? can you not be waterproofing? can he not be waterproofing? can we not be waterproofing? can you not be waterproofing? can they not be waterproofing?
Perfect
can I not have waterproofed? can you not have waterproofed? can he not have waterproofed? can we not have waterproofed? can you not have waterproofed? can they not have waterproofed?
V-ing perfect
can I not have been waterproofing? can you not have been waterproofing? can he not have been waterproofing? can we not have been waterproofing? can you not have been waterproofing? can they not have been waterproofing?