I must hollow you must hollow she must hollow we must hollow you must hollow they must hollow
V-ing form
I must be hollowing you must be hollowing she must be hollowing we must be hollowing you must be hollowing they must be hollowing
Perfect
I must have hollowed you must have hollowed she must have hollowed we must have hollowed you must have hollowed they must have hollowed
V-ing perfect
I must have been hollowing you must have been hollowing she must have been hollowing we must have been hollowing you must have been hollowing they must have been hollowing
Negation
Simple form
I must not hollow you must not hollow she must not hollow we must not hollow you must not hollow they must not hollow
V-ing form
I must not be hollowing you must not be hollowing she must not be hollowing we must not be hollowing you must not be hollowing they must not be hollowing
Perfect
I must not have hollowed you must not have hollowed she must not have hollowed we must not have hollowed you must not have hollowed they must not have hollowed
V-ing perfect
I must not have been hollowing you must not have been hollowing she must not have been hollowing we must not have been hollowing you must not have been hollowing they must not have been hollowing
Interrogative form
Simple form
must I hollow? must you hollow? must she hollow? must we hollow? must you hollow? must they hollow?
V-ing form
must I be hollowing? must you be hollowing? must she be hollowing? must we be hollowing? must you be hollowing? must they be hollowing?
Perfect
must I have hollowed? must you have hollowed? must she have hollowed? must we have hollowed? must you have hollowed? must they have hollowed?
V-ing perfect
must I have been hollowing? must you have been hollowing? must she have been hollowing? must we have been hollowing? must you have been hollowing? must they have been hollowing?
Interro-negative form
Simple form
must I not hollow? must you not hollow? must she not hollow? must we not hollow? must you not hollow? must they not hollow?
V-ing form
must I not be hollowing? must you not be hollowing? must she not be hollowing? must we not be hollowing? must you not be hollowing? must they not be hollowing?
Perfect
must I not have hollowed? must you not have hollowed? must she not have hollowed? must we not have hollowed? must you not have hollowed? must they not have hollowed?
V-ing perfect
must I not have been hollowing? must you not have been hollowing? must she not have been hollowing? must we not have been hollowing? must you not have been hollowing? must they not have been hollowing?