I could fiddle you could fiddle she could fiddle we could fiddle you could fiddle they could fiddle
V-ing form
I could be fiddling you could be fiddling she could be fiddling we could be fiddling you could be fiddling they could be fiddling
Perfect
I could have fiddled you could have fiddled she could have fiddled we could have fiddled you could have fiddled they could have fiddled
V-ing perfect
I could have been fiddling you could have been fiddling she could have been fiddling we could have been fiddling you could have been fiddling they could have been fiddling
Negation
Simple form
I could not fiddle you could not fiddle she could not fiddle we could not fiddle you could not fiddle they could not fiddle
V-ing form
I could not be fiddling you could not be fiddling she could not be fiddling we could not be fiddling you could not be fiddling they could not be fiddling
Perfect
I could not have fiddled you could not have fiddled she could not have fiddled we could not have fiddled you could not have fiddled they could not have fiddled
V-ing perfect
I could not have been fiddling you could not have been fiddling she could not have been fiddling we could not have been fiddling you could not have been fiddling they could not have been fiddling
Interrogative form
Simple form
could I fiddle? could you fiddle? could she fiddle? could we fiddle? could you fiddle? could they fiddle?
V-ing form
could I be fiddling? could you be fiddling? could she be fiddling? could we be fiddling? could you be fiddling? could they be fiddling?
Perfect
could I have fiddled? could you have fiddled? could she have fiddled? could we have fiddled? could you have fiddled? could they have fiddled?
V-ing perfect
could I have been fiddling? could you have been fiddling? could she have been fiddling? could we have been fiddling? could you have been fiddling? could they have been fiddling?
Interro-negative form
Simple form
could I not fiddle? could you not fiddle? could she not fiddle? could we not fiddle? could you not fiddle? could they not fiddle?
V-ing form
could I not be fiddling? could you not be fiddling? could she not be fiddling? could we not be fiddling? could you not be fiddling? could they not be fiddling?
Perfect
could I not have fiddled? could you not have fiddled? could she not have fiddled? could we not have fiddled? could you not have fiddled? could they not have fiddled?
V-ing perfect
could I not have been fiddling? could you not have been fiddling? could she not have been fiddling? could we not have been fiddling? could you not have been fiddling? could they not have been fiddling?