I must define you must define he must define we must define you must define they must define
V-ing form
I must be defining you must be defining he must be defining we must be defining you must be defining they must be defining
Perfect
I must have defined you must have defined he must have defined we must have defined you must have defined they must have defined
V-ing perfect
I must have been defining you must have been defining he must have been defining we must have been defining you must have been defining they must have been defining
Negation
Simple form
I must not define you must not define he must not define we must not define you must not define they must not define
V-ing form
I must not be defining you must not be defining he must not be defining we must not be defining you must not be defining they must not be defining
Perfect
I must not have defined you must not have defined he must not have defined we must not have defined you must not have defined they must not have defined
V-ing perfect
I must not have been defining you must not have been defining he must not have been defining we must not have been defining you must not have been defining they must not have been defining
Interrogative form
Simple form
must I define? must you define? must he define? must we define? must you define? must they define?
V-ing form
must I be defining? must you be defining? must he be defining? must we be defining? must you be defining? must they be defining?
Perfect
must I have defined? must you have defined? must he have defined? must we have defined? must you have defined? must they have defined?
V-ing perfect
must I have been defining? must you have been defining? must he have been defining? must we have been defining? must you have been defining? must they have been defining?
Interro-negative form
Simple form
must I not define? must you not define? must he not define? must we not define? must you not define? must they not define?
V-ing form
must I not be defining? must you not be defining? must he not be defining? must we not be defining? must you not be defining? must they not be defining?
Perfect
must I not have defined? must you not have defined? must he not have defined? must we not have defined? must you not have defined? must they not have defined?
V-ing perfect
must I not have been defining? must you not have been defining? must he not have been defining? must we not have been defining? must you not have been defining? must they not have been defining?