English verb conjugation
MUST WATERPROOF

Regular verb: waterproof - waterproofed - waterproofed

Affirmation

Simple form	V-ing form
I must waterproof you must waterproof he must waterproof we must waterproof you must waterproof they must waterproof	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	V-ing 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	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

Negation

Simple form	V-ing form
I mustn't waterproof you mustn't waterproof he mustn't waterproof we mustn't waterproof you mustn't waterproof they mustn't waterproof	I mustn't be waterproofing you mustn't be waterproofing he mustn't be waterproofing we mustn't be waterproofing you mustn't be waterproofing they mustn't be waterproofing
Perfect	V-ing perfect
I mustn't have waterproofed you mustn't have waterproofed he mustn't have waterproofed we mustn't have waterproofed you mustn't have waterproofed they mustn't have waterproofed	I mustn't have been waterproofing you mustn't have been waterproofing he mustn't have been waterproofing we mustn't have been waterproofing you mustn't have been waterproofing they mustn't have been waterproofing

Interrogative form

Simple form	V-ing form
must I waterproof? must you waterproof? must he waterproof? must we waterproof? must you waterproof? must they waterproof?	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	V-ing 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?	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?

Interro-negative form

Simple form	V-ing form
mustn't I waterproof? mustn't you waterproof? mustn't he waterproof? mustn't we waterproof? mustn't you waterproof? mustn't they waterproof?	mustn't I be waterproofing? mustn't you be waterproofing? mustn't he be waterproofing? mustn't we be waterproofing? mustn't you be waterproofing? mustn't they be waterproofing?
Perfect	V-ing perfect
mustn't I have waterproofed? mustn't you have waterproofed? mustn't he have waterproofed? mustn't we have waterproofed? mustn't you have waterproofed? mustn't they have waterproofed?	mustn't I have been waterproofing? mustn't you have been waterproofing? mustn't he have been waterproofing? mustn't we have been waterproofing? mustn't you have been waterproofing? mustn't they have been waterproofing?