must bark
Regular verb: bark - barked- barked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must bark
you must bark
she must bark
we must bark
you must bark
they must bark 	I must be barking
you must be barking
she must be barking
we must be barking
you must be barking
they must be barking	I must have barked
you must have barked
she must have barked
we must have barked
you must have barked
they must have barked	I must have been barking
you must have been barking
she must have been barking
we must have been barking
you must have been barking
they must have been barking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't bark
you mustn't bark
she mustn't bark
we mustn't bark
you mustn't bark
they mustn't bark 	I mustn't be barking
you mustn't be barking
she mustn't be barking
we mustn't be barking
you mustn't be barking
they mustn't be barking	I mustn't have barked
you mustn't have barked
she mustn't have barked
we mustn't have barked
you mustn't have barked
they mustn't have barked	I mustn't have been barking
you mustn't have been barking
she mustn't have been barking
we mustn't have been barking
you mustn't have been barking
they mustn't have been barking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I bark?
must you bark?
must she bark?
must we bark?
must you bark?
must they bark? 	must I be barking?
must you be barking?
must she be barking?
must we be barking?
must you be barking?
must they be barking? 	must I have barked?
must you have barked?
must she have barked?
must we have barked?
must you have barked?
must they have barked? 	must I have been barking?
must you have been barking?
must she have been barking?
must we have been barking?
must you have been barking?
must they have been barking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I bark?
mustn't you bark?
mustn't she bark?
mustn't we bark?
mustn't you bark?
mustn't they bark? 	mustn't I be barking?
mustn't you be barking?
mustn't she be barking?
mustn't we be barking?
mustn't you be barking?
mustn't they be barking? 	mustn't I have barked?
mustn't you have barked?
mustn't she have barked?
mustn't we have barked?
mustn't you have barked?
mustn't they have barked? 	mustn't I have been barking?
mustn't you have been barking?
mustn't she have been barking?
mustn't we have been barking?
mustn't you have been barking?
mustn't they have been barking?