must twiddle
Regular verb: twiddle - twiddled- twiddled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must twiddle
you must twiddle
he must twiddle
we must twiddle
you must twiddle
they must twiddle 	I must be twiddling
you must be twiddling
he must be twiddling
we must be twiddling
you must be twiddling
they must be twiddling	I must have twiddled
you must have twiddled
he must have twiddled
we must have twiddled
you must have twiddled
they must have twiddled	I must have been twiddling
you must have been twiddling
he must have been twiddling
we must have been twiddling
you must have been twiddling
they must have been twiddling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't twiddle
you mustn't twiddle
he mustn't twiddle
we mustn't twiddle
you mustn't twiddle
they mustn't twiddle 	I mustn't be twiddling
you mustn't be twiddling
he mustn't be twiddling
we mustn't be twiddling
you mustn't be twiddling
they mustn't be twiddling	I mustn't have twiddled
you mustn't have twiddled
he mustn't have twiddled
we mustn't have twiddled
you mustn't have twiddled
they mustn't have twiddled	I mustn't have been twiddling
you mustn't have been twiddling
he mustn't have been twiddling
we mustn't have been twiddling
you mustn't have been twiddling
they mustn't have been twiddling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I twiddle?
must you twiddle?
must he twiddle?
must we twiddle?
must you twiddle?
must they twiddle? 	must I be twiddling?
must you be twiddling?
must he be twiddling?
must we be twiddling?
must you be twiddling?
must they be twiddling? 	must I have twiddled?
must you have twiddled?
must he have twiddled?
must we have twiddled?
must you have twiddled?
must they have twiddled? 	must I have been twiddling?
must you have been twiddling?
must he have been twiddling?
must we have been twiddling?
must you have been twiddling?
must they have been twiddling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I twiddle?
mustn't you twiddle?
mustn't he twiddle?
mustn't we twiddle?
mustn't you twiddle?
mustn't they twiddle? 	mustn't I be twiddling?
mustn't you be twiddling?
mustn't he be twiddling?
mustn't we be twiddling?
mustn't you be twiddling?
mustn't they be twiddling? 	mustn't I have twiddled?
mustn't you have twiddled?
mustn't he have twiddled?
mustn't we have twiddled?
mustn't you have twiddled?
mustn't they have twiddled? 	mustn't I have been twiddling?
mustn't you have been twiddling?
mustn't he have been twiddling?
mustn't we have been twiddling?
mustn't you have been twiddling?
mustn't they have been twiddling?