could twiddle
Regular verb: twiddle - twiddled- twiddled

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

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

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

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