I must kid you must kid he must kid we must kid you must kid they must kid
V-ing form
I must be kiding you must be kiding he must be kiding we must be kiding you must be kiding they must be kiding
Perfect
I must have kided you must have kided he must have kided we must have kided you must have kided they must have kided
V-ing perfect
I must have been kiding you must have been kiding he must have been kiding we must have been kiding you must have been kiding they must have been kiding
Negation
Simple form
I must not kid you must not kid he must not kid we must not kid you must not kid they must not kid
V-ing form
I must not be kiding you must not be kiding he must not be kiding we must not be kiding you must not be kiding they must not be kiding
Perfect
I must not have kided you must not have kided he must not have kided we must not have kided you must not have kided they must not have kided
V-ing perfect
I must not have been kiding you must not have been kiding he must not have been kiding we must not have been kiding you must not have been kiding they must not have been kiding
Interrogative form
Simple form
must I kid? must you kid? must he kid? must we kid? must you kid? must they kid?
V-ing form
must I be kiding? must you be kiding? must he be kiding? must we be kiding? must you be kiding? must they be kiding?
Perfect
must I have kided? must you have kided? must he have kided? must we have kided? must you have kided? must they have kided?
V-ing perfect
must I have been kiding? must you have been kiding? must he have been kiding? must we have been kiding? must you have been kiding? must they have been kiding?
Interro-negative form
Simple form
must I not kid? must you not kid? must he not kid? must we not kid? must you not kid? must they not kid?
V-ing form
must I not be kiding? must you not be kiding? must he not be kiding? must we not be kiding? must you not be kiding? must they not be kiding?
Perfect
must I not have kided? must you not have kided? must he not have kided? must we not have kided? must you not have kided? must they not have kided?
V-ing perfect
must I not have been kiding? must you not have been kiding? must he not have been kiding? must we not have been kiding? must you not have been kiding? must they not have been kiding?