I must suffocate you must suffocate he must suffocate we must suffocate you must suffocate they must suffocate
V-ing form
I must be suffocating you must be suffocating he must be suffocating we must be suffocating you must be suffocating they must be suffocating
Perfect
I must have suffocated you must have suffocated he must have suffocated we must have suffocated you must have suffocated they must have suffocated
V-ing perfect
I must have been suffocating you must have been suffocating he must have been suffocating we must have been suffocating you must have been suffocating they must have been suffocating
Negation
Simple form
I must not suffocate you must not suffocate he must not suffocate we must not suffocate you must not suffocate they must not suffocate
V-ing form
I must not be suffocating you must not be suffocating he must not be suffocating we must not be suffocating you must not be suffocating they must not be suffocating
Perfect
I must not have suffocated you must not have suffocated he must not have suffocated we must not have suffocated you must not have suffocated they must not have suffocated
V-ing perfect
I must not have been suffocating you must not have been suffocating he must not have been suffocating we must not have been suffocating you must not have been suffocating they must not have been suffocating
Interrogative form
Simple form
must I suffocate? must you suffocate? must he suffocate? must we suffocate? must you suffocate? must they suffocate?
V-ing form
must I be suffocating? must you be suffocating? must he be suffocating? must we be suffocating? must you be suffocating? must they be suffocating?
Perfect
must I have suffocated? must you have suffocated? must he have suffocated? must we have suffocated? must you have suffocated? must they have suffocated?
V-ing perfect
must I have been suffocating? must you have been suffocating? must he have been suffocating? must we have been suffocating? must you have been suffocating? must they have been suffocating?
Interro-negative form
Simple form
must I not suffocate? must you not suffocate? must he not suffocate? must we not suffocate? must you not suffocate? must they not suffocate?
V-ing form
must I not be suffocating? must you not be suffocating? must he not be suffocating? must we not be suffocating? must you not be suffocating? must they not be suffocating?
Perfect
must I not have suffocated? must you not have suffocated? must he not have suffocated? must we not have suffocated? must you not have suffocated? must they not have suffocated?
V-ing perfect
must I not have been suffocating? must you not have been suffocating? must he not have been suffocating? must we not have been suffocating? must you not have been suffocating? must they not have been suffocating?