I must waterproof you must waterproof he must waterproof we must waterproof you must waterproof they must waterproof
Forme en V-ing
I must be waterproofing you must be waterproofing he must be waterproofing we must be waterproofing you must be waterproofing they must be waterproofing
Perfect
I must have waterproofed you must have waterproofed he must have waterproofed we must have waterproofed you must have waterproofed they must have waterproofed
Perfect en V-ing
I must have been waterproofing you must have been waterproofing he must have been waterproofing we must have been waterproofing you must have been waterproofing they must have been waterproofing
Négation
Forme simple
I must not waterproof you must not waterproof he must not waterproof we must not waterproof you must not waterproof they must not waterproof
Forme en V-ing
I must not be waterproofing you must not be waterproofing he must not be waterproofing we must not be waterproofing you must not be waterproofing they must not be waterproofing
Perfect
I must not have waterproofed you must not have waterproofed he must not have waterproofed we must not have waterproofed you must not have waterproofed they must not have waterproofed
Perfect en V-ing
I must not have been waterproofing you must not have been waterproofing he must not have been waterproofing we must not have been waterproofing you must not have been waterproofing they must not have been waterproofing
Forme interrogative
Forme simple
must I waterproof? must you waterproof? must he waterproof? must we waterproof? must you waterproof? must they waterproof?
Forme en V-ing
must I be waterproofing? must you be waterproofing? must he be waterproofing? must we be waterproofing? must you be waterproofing? must they be waterproofing?
Perfect
must I have waterproofed? must you have waterproofed? must he have waterproofed? must we have waterproofed? must you have waterproofed? must they have waterproofed?
Perfect en V-ing
must I have been waterproofing? must you have been waterproofing? must he have been waterproofing? must we have been waterproofing? must you have been waterproofing? must they have been waterproofing?
Forme interro-négative
Forme simple
must I not waterproof? must you not waterproof? must he not waterproof? must we not waterproof? must you not waterproof? must they not waterproof?
Forme en V-ing
must I not be waterproofing? must you not be waterproofing? must he not be waterproofing? must we not be waterproofing? must you not be waterproofing? must they not be waterproofing?
Perfect
must I not have waterproofed? must you not have waterproofed? must he not have waterproofed? must we not have waterproofed? must you not have waterproofed? must they not have waterproofed?
Perfect en V-ing
must I not have been waterproofing? must you not have been waterproofing? must he not have been waterproofing? must we not have been waterproofing? must you not have been waterproofing? must they not have been waterproofing?