I could fiddle you could fiddle he could fiddle we could fiddle you could fiddle they could fiddle
V-ing form
I could be fiddling you could be fiddling he could be fiddling we could be fiddling you could be fiddling they could be fiddling
Perfect
I could have fiddled you could have fiddled he 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 he could have been fiddling we could have been fiddling you could have been fiddling they could have been fiddling
Negation
Simple form
I couldn't fiddle you couldn't fiddle he couldn't fiddle we couldn't fiddle you couldn't fiddle they couldn't fiddle
V-ing form
I couldn't be fiddling you couldn't be fiddling he couldn't be fiddling we couldn't be fiddling you couldn't be fiddling they couldn't be fiddling
Perfect
I couldn't have fiddled you couldn't have fiddled he couldn't have fiddled we couldn't have fiddled you couldn't have fiddled they couldn't have fiddled
V-ing perfect
I couldn't have been fiddling you couldn't have been fiddling he couldn't have been fiddling we couldn't have been fiddling you couldn't have been fiddling they couldn't have been fiddling
Interrogative form
Simple form
could I fiddle? could you fiddle? could he fiddle? could we fiddle? could you fiddle? could they fiddle?
V-ing form
could I be fiddling? could you be fiddling? could he be fiddling? could we be fiddling? could you be fiddling? could they be fiddling?
Perfect
could I have fiddled? could you have fiddled? could he 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 he have been fiddling? could we have been fiddling? could you have been fiddling? could they have been fiddling?
Interro-negative form
Simple form
couldn't I fiddle? couldn't you fiddle? couldn't he fiddle? couldn't we fiddle? couldn't you fiddle? couldn't they fiddle?
V-ing form
couldn't I be fiddling? couldn't you be fiddling? couldn't he be fiddling? couldn't we be fiddling? couldn't you be fiddling? couldn't they be fiddling?
Perfect
couldn't I have fiddled? couldn't you have fiddled? couldn't he have fiddled? couldn't we have fiddled? couldn't you have fiddled? couldn't they have fiddled?
V-ing perfect
couldn't I have been fiddling? couldn't you have been fiddling? couldn't he have been fiddling? couldn't we have been fiddling? couldn't you have been fiddling? couldn't they have been fiddling?