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 could not twiddle
you could not twiddle
she could not twiddle
we could not twiddle
you could not twiddle
they could not twiddle 	I could not be twiddling
you could not be twiddling
she could not be twiddling
we could not be twiddling
you could not be twiddling
they could not be twiddling	I could not have twiddled
you could not have twiddled
she could not have twiddled
we could not have twiddled
you could not have twiddled
they could not have twiddled	I could not have been twiddling
you could not have been twiddling
she could not have been twiddling
we could not have been twiddling
you could not have been twiddling
they could not 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 	
could I not twiddle?
could you not twiddle?
could she not twiddle?
could we not twiddle?
could you not twiddle?
could they not twiddle? 	could I not be twiddling?
could you not be twiddling?
could she not be twiddling?
could we not be twiddling?
could you not be twiddling?
could they not be twiddling? 	could I not have twiddled?
could you not have twiddled?
could she not have twiddled?
could we not have twiddled?
could you not have twiddled?
could they not have twiddled? 	could I not have been twiddling?
could you not have been twiddling?
could she not have been twiddling?
could we not have been twiddling?
could you not have been twiddling?
could they not have been twiddling?