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