I must scrimshaw you must scrimshaw he must scrimshaw we must scrimshaw you must scrimshaw they must scrimshaw
V-ing form
I must be scrimshawing you must be scrimshawing he must be scrimshawing we must be scrimshawing you must be scrimshawing they must be scrimshawing
Perfect
I must have scrimshawed you must have scrimshawed he must have scrimshawed we must have scrimshawed you must have scrimshawed they must have scrimshawed
V-ing perfect
I must have been scrimshawing you must have been scrimshawing he must have been scrimshawing we must have been scrimshawing you must have been scrimshawing they must have been scrimshawing
Negation
Simple form
I must not scrimshaw you must not scrimshaw he must not scrimshaw we must not scrimshaw you must not scrimshaw they must not scrimshaw
V-ing form
I must not be scrimshawing you must not be scrimshawing he must not be scrimshawing we must not be scrimshawing you must not be scrimshawing they must not be scrimshawing
Perfect
I must not have scrimshawed you must not have scrimshawed he must not have scrimshawed we must not have scrimshawed you must not have scrimshawed they must not have scrimshawed
V-ing perfect
I must not have been scrimshawing you must not have been scrimshawing he must not have been scrimshawing we must not have been scrimshawing you must not have been scrimshawing they must not have been scrimshawing
Interrogative form
Simple form
must I scrimshaw? must you scrimshaw? must he scrimshaw? must we scrimshaw? must you scrimshaw? must they scrimshaw?
V-ing form
must I be scrimshawing? must you be scrimshawing? must he be scrimshawing? must we be scrimshawing? must you be scrimshawing? must they be scrimshawing?
Perfect
must I have scrimshawed? must you have scrimshawed? must he have scrimshawed? must we have scrimshawed? must you have scrimshawed? must they have scrimshawed?
V-ing perfect
must I have been scrimshawing? must you have been scrimshawing? must he have been scrimshawing? must we have been scrimshawing? must you have been scrimshawing? must they have been scrimshawing?
Interro-negative form
Simple form
must I not scrimshaw? must you not scrimshaw? must he not scrimshaw? must we not scrimshaw? must you not scrimshaw? must they not scrimshaw?
V-ing form
must I not be scrimshawing? must you not be scrimshawing? must he not be scrimshawing? must we not be scrimshawing? must you not be scrimshawing? must they not be scrimshawing?
Perfect
must I not have scrimshawed? must you not have scrimshawed? must he not have scrimshawed? must we not have scrimshawed? must you not have scrimshawed? must they not have scrimshawed?
V-ing perfect
must I not have been scrimshawing? must you not have been scrimshawing? must he not have been scrimshawing? must we not have been scrimshawing? must you not have been scrimshawing? must they not have been scrimshawing?