must twiddle
Regular verb: twiddle - twiddled- twiddled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must twiddle
you must twiddle
she must twiddle
we must twiddle
you must twiddle
they must twiddle 	I must be twiddling
you must be twiddling
she must be twiddling
we must be twiddling
you must be twiddling
they must be twiddling	I must have twiddled
you must have twiddled
she 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
she 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
she 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
she 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
she 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
she 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 she twiddle?
must we twiddle?
must you twiddle?
must they twiddle? 	must I be twiddling?
must you be twiddling?
must she be twiddling?
must we be twiddling?
must you be twiddling?
must they be twiddling? 	must I have twiddled?
must you have twiddled?
must she 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 she 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 she 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 she 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 she 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 she have been twiddling?
mustn't we have been twiddling?
mustn't you have been twiddling?
mustn't they have been twiddling?