must twit
Regular verb: twit - twitted- twitted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must twit
you must twit
he must twit
we must twit
you must twit
they must twit 	I must be twitting
you must be twitting
he must be twitting
we must be twitting
you must be twitting
they must be twitting	I must have twitted
you must have twitted
he must have twitted
we must have twitted
you must have twitted
they must have twitted	I must have been twitting
you must have been twitting
he must have been twitting
we must have been twitting
you must have been twitting
they must have been twitting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't twit
you mustn't twit
he mustn't twit
we mustn't twit
you mustn't twit
they mustn't twit 	I mustn't be twitting
you mustn't be twitting
he mustn't be twitting
we mustn't be twitting
you mustn't be twitting
they mustn't be twitting	I mustn't have twitted
you mustn't have twitted
he mustn't have twitted
we mustn't have twitted
you mustn't have twitted
they mustn't have twitted	I mustn't have been twitting
you mustn't have been twitting
he mustn't have been twitting
we mustn't have been twitting
you mustn't have been twitting
they mustn't have been twitting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I twit?
must you twit?
must he twit?
must we twit?
must you twit?
must they twit? 	must I be twitting?
must you be twitting?
must he be twitting?
must we be twitting?
must you be twitting?
must they be twitting? 	must I have twitted?
must you have twitted?
must he have twitted?
must we have twitted?
must you have twitted?
must they have twitted? 	must I have been twitting?
must you have been twitting?
must he have been twitting?
must we have been twitting?
must you have been twitting?
must they have been twitting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I twit?
mustn't you twit?
mustn't he twit?
mustn't we twit?
mustn't you twit?
mustn't they twit? 	mustn't I be twitting?
mustn't you be twitting?
mustn't he be twitting?
mustn't we be twitting?
mustn't you be twitting?
mustn't they be twitting? 	mustn't I have twitted?
mustn't you have twitted?
mustn't he have twitted?
mustn't we have twitted?
mustn't you have twitted?
mustn't they have twitted? 	mustn't I have been twitting?
mustn't you have been twitting?
mustn't he have been twitting?
mustn't we have been twitting?
mustn't you have been twitting?
mustn't they have been twitting?