I must rainproof you must rainproof he must rainproof we must rainproof you must rainproof they must rainproof
V-ing form
I must be rainproofing you must be rainproofing he must be rainproofing we must be rainproofing you must be rainproofing they must be rainproofing
Perfect
I must have rainproofed you must have rainproofed he must have rainproofed we must have rainproofed you must have rainproofed they must have rainproofed
V-ing perfect
I must have been rainproofing you must have been rainproofing he must have been rainproofing we must have been rainproofing you must have been rainproofing they must have been rainproofing
Negation
Simple form
I must not rainproof you must not rainproof he must not rainproof we must not rainproof you must not rainproof they must not rainproof
V-ing form
I must not be rainproofing you must not be rainproofing he must not be rainproofing we must not be rainproofing you must not be rainproofing they must not be rainproofing
Perfect
I must not have rainproofed you must not have rainproofed he must not have rainproofed we must not have rainproofed you must not have rainproofed they must not have rainproofed
V-ing perfect
I must not have been rainproofing you must not have been rainproofing he must not have been rainproofing we must not have been rainproofing you must not have been rainproofing they must not have been rainproofing
Interrogative form
Simple form
must I rainproof? must you rainproof? must he rainproof? must we rainproof? must you rainproof? must they rainproof?
V-ing form
must I be rainproofing? must you be rainproofing? must he be rainproofing? must we be rainproofing? must you be rainproofing? must they be rainproofing?
Perfect
must I have rainproofed? must you have rainproofed? must he have rainproofed? must we have rainproofed? must you have rainproofed? must they have rainproofed?
V-ing perfect
must I have been rainproofing? must you have been rainproofing? must he have been rainproofing? must we have been rainproofing? must you have been rainproofing? must they have been rainproofing?
Interro-negative form
Simple form
must I not rainproof? must you not rainproof? must he not rainproof? must we not rainproof? must you not rainproof? must they not rainproof?
V-ing form
must I not be rainproofing? must you not be rainproofing? must he not be rainproofing? must we not be rainproofing? must you not be rainproofing? must they not be rainproofing?
Perfect
must I not have rainproofed? must you not have rainproofed? must he not have rainproofed? must we not have rainproofed? must you not have rainproofed? must they not have rainproofed?
V-ing perfect
must I not have been rainproofing? must you not have been rainproofing? must he not have been rainproofing? must we not have been rainproofing? must you not have been rainproofing? must they not have been rainproofing?