I could tinkle you could tinkle she could tinkle we could tinkle you could tinkle they could tinkle
V-ing form
I could be tinkling you could be tinkling she could be tinkling we could be tinkling you could be tinkling they could be tinkling
Perfect
I could have tinkled you could have tinkled she could have tinkled we could have tinkled you could have tinkled they could have tinkled
V-ing perfect
I could have been tinkling you could have been tinkling she could have been tinkling we could have been tinkling you could have been tinkling they could have been tinkling
Negation
Simple form
I could not tinkle you could not tinkle she could not tinkle we could not tinkle you could not tinkle they could not tinkle
V-ing form
I could not be tinkling you could not be tinkling she could not be tinkling we could not be tinkling you could not be tinkling they could not be tinkling
Perfect
I could not have tinkled you could not have tinkled she could not have tinkled we could not have tinkled you could not have tinkled they could not have tinkled
V-ing perfect
I could not have been tinkling you could not have been tinkling she could not have been tinkling we could not have been tinkling you could not have been tinkling they could not have been tinkling
Interrogative form
Simple form
could I tinkle? could you tinkle? could she tinkle? could we tinkle? could you tinkle? could they tinkle?
V-ing form
could I be tinkling? could you be tinkling? could she be tinkling? could we be tinkling? could you be tinkling? could they be tinkling?
Perfect
could I have tinkled? could you have tinkled? could she have tinkled? could we have tinkled? could you have tinkled? could they have tinkled?
V-ing perfect
could I have been tinkling? could you have been tinkling? could she have been tinkling? could we have been tinkling? could you have been tinkling? could they have been tinkling?
Interro-negative form
Simple form
could I not tinkle? could you not tinkle? could she not tinkle? could we not tinkle? could you not tinkle? could they not tinkle?
V-ing form
could I not be tinkling? could you not be tinkling? could she not be tinkling? could we not be tinkling? could you not be tinkling? could they not be tinkling?
Perfect
could I not have tinkled? could you not have tinkled? could she not have tinkled? could we not have tinkled? could you not have tinkled? could they not have tinkled?
V-ing perfect
could I not have been tinkling? could you not have been tinkling? could she not have been tinkling? could we not have been tinkling? could you not have been tinkling? could they not have been tinkling?