must obey
Regular verb: obey - obeyed- obeyed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must obey
you must obey
she must obey
we must obey
you must obey
they must obey 	I must be obeying
you must be obeying
she must be obeying
we must be obeying
you must be obeying
they must be obeying	I must have obeyed
you must have obeyed
she must have obeyed
we must have obeyed
you must have obeyed
they must have obeyed	I must have been obeying
you must have been obeying
she must have been obeying
we must have been obeying
you must have been obeying
they must have been obeying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't obey
you mustn't obey
she mustn't obey
we mustn't obey
you mustn't obey
they mustn't obey 	I mustn't be obeying
you mustn't be obeying
she mustn't be obeying
we mustn't be obeying
you mustn't be obeying
they mustn't be obeying	I mustn't have obeyed
you mustn't have obeyed
she mustn't have obeyed
we mustn't have obeyed
you mustn't have obeyed
they mustn't have obeyed	I mustn't have been obeying
you mustn't have been obeying
she mustn't have been obeying
we mustn't have been obeying
you mustn't have been obeying
they mustn't have been obeying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I obey?
must you obey?
must she obey?
must we obey?
must you obey?
must they obey? 	must I be obeying?
must you be obeying?
must she be obeying?
must we be obeying?
must you be obeying?
must they be obeying? 	must I have obeyed?
must you have obeyed?
must she have obeyed?
must we have obeyed?
must you have obeyed?
must they have obeyed? 	must I have been obeying?
must you have been obeying?
must she have been obeying?
must we have been obeying?
must you have been obeying?
must they have been obeying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I obey?
mustn't you obey?
mustn't she obey?
mustn't we obey?
mustn't you obey?
mustn't they obey? 	mustn't I be obeying?
mustn't you be obeying?
mustn't she be obeying?
mustn't we be obeying?
mustn't you be obeying?
mustn't they be obeying? 	mustn't I have obeyed?
mustn't you have obeyed?
mustn't she have obeyed?
mustn't we have obeyed?
mustn't you have obeyed?
mustn't they have obeyed? 	mustn't I have been obeying?
mustn't you have been obeying?
mustn't she have been obeying?
mustn't we have been obeying?
mustn't you have been obeying?
mustn't they have been obeying?