Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could fizz. fizzle you could fizz. fizzle she could fizz. fizzle we could fizz. fizzle you could fizz. fizzle they could fizz. fizzle
V-ing form
I could be fizz. fizzling you could be fizz. fizzling she could be fizz. fizzling we could be fizz. fizzling you could be fizz. fizzling they could be fizz. fizzling
Perfect
I could have fizz. fizzled you could have fizz. fizzled she could have fizz. fizzled we could have fizz. fizzled you could have fizz. fizzled they could have fizz. fizzled
V-ing perfect
I could have been fizz. fizzling you could have been fizz. fizzling she could have been fizz. fizzling we could have been fizz. fizzling you could have been fizz. fizzling they could have been fizz. fizzling
Negation
Simple form
I couldn't fizz. fizzle you couldn't fizz. fizzle she couldn't fizz. fizzle we couldn't fizz. fizzle you couldn't fizz. fizzle they couldn't fizz. fizzle
V-ing form
I couldn't be fizz. fizzling you couldn't be fizz. fizzling she couldn't be fizz. fizzling we couldn't be fizz. fizzling you couldn't be fizz. fizzling they couldn't be fizz. fizzling
Perfect
I couldn't have fizz. fizzled you couldn't have fizz. fizzled she couldn't have fizz. fizzled we couldn't have fizz. fizzled you couldn't have fizz. fizzled they couldn't have fizz. fizzled
V-ing perfect
I couldn't have been fizz. fizzling you couldn't have been fizz. fizzling she couldn't have been fizz. fizzling we couldn't have been fizz. fizzling you couldn't have been fizz. fizzling they couldn't have been fizz. fizzling
Interrogative form
Simple form
could I fizz. fizzle? could you fizz. fizzle? could she fizz. fizzle? could we fizz. fizzle? could you fizz. fizzle? could they fizz. fizzle?
V-ing form
could I be fizz. fizzling? could you be fizz. fizzling? could she be fizz. fizzling? could we be fizz. fizzling? could you be fizz. fizzling? could they be fizz. fizzling?
Perfect
could I have fizz. fizzled? could you have fizz. fizzled? could she have fizz. fizzled? could we have fizz. fizzled? could you have fizz. fizzled? could they have fizz. fizzled?
V-ing perfect
could I have been fizz. fizzling? could you have been fizz. fizzling? could she have been fizz. fizzling? could we have been fizz. fizzling? could you have been fizz. fizzling? could they have been fizz. fizzling?
Interro-negative form
Simple form
couldn't I fizz. fizzle? couldn't you fizz. fizzle? couldn't she fizz. fizzle? couldn't we fizz. fizzle? couldn't you fizz. fizzle? couldn't they fizz. fizzle?
V-ing form
couldn't I be fizz. fizzling? couldn't you be fizz. fizzling? couldn't she be fizz. fizzling? couldn't we be fizz. fizzling? couldn't you be fizz. fizzling? couldn't they be fizz. fizzling?
Perfect
couldn't I have fizz. fizzled? couldn't you have fizz. fizzled? couldn't she have fizz. fizzled? couldn't we have fizz. fizzled? couldn't you have fizz. fizzled? couldn't they have fizz. fizzled?
V-ing perfect
couldn't I have been fizz. fizzling? couldn't you have been fizz. fizzling? couldn't she have been fizz. fizzling? couldn't we have been fizz. fizzling? couldn't you have been fizz. fizzling? couldn't they have been fizz. fizzling?