English verb conjugation
COULD FIZZ

Regular verb: fizz - fizzed - fizzed

Affirmation

Simple form	V-ing form
I could fizz you could fizz he could fizz we could fizz you could fizz they could fizz	I could be fizzing you could be fizzing he could be fizzing we could be fizzing you could be fizzing they could be fizzing
Perfect	V-ing perfect
I could have fizzed you could have fizzed he could have fizzed we could have fizzed you could have fizzed they could have fizzed	I could have been fizzing you could have been fizzing he could have been fizzing we could have been fizzing you could have been fizzing they could have been fizzing

Negation

Simple form	V-ing form
I couldn't fizz you couldn't fizz he couldn't fizz we couldn't fizz you couldn't fizz they couldn't fizz	I couldn't be fizzing you couldn't be fizzing he couldn't be fizzing we couldn't be fizzing you couldn't be fizzing they couldn't be fizzing
Perfect	V-ing perfect
I couldn't have fizzed you couldn't have fizzed he couldn't have fizzed we couldn't have fizzed you couldn't have fizzed they couldn't have fizzed	I couldn't have been fizzing you couldn't have been fizzing he couldn't have been fizzing we couldn't have been fizzing you couldn't have been fizzing they couldn't have been fizzing

Interrogative form

Simple form	V-ing form
could I fizz? could you fizz? could he fizz? could we fizz? could you fizz? could they fizz?	could I be fizzing? could you be fizzing? could he be fizzing? could we be fizzing? could you be fizzing? could they be fizzing?
Perfect	V-ing perfect
could I have fizzed? could you have fizzed? could he have fizzed? could we have fizzed? could you have fizzed? could they have fizzed?	could I have been fizzing? could you have been fizzing? could he have been fizzing? could we have been fizzing? could you have been fizzing? could they have been fizzing?

Interro-negative form

Simple form	V-ing form
couldn't I fizz? couldn't you fizz? couldn't he fizz? couldn't we fizz? couldn't you fizz? couldn't they fizz?	couldn't I be fizzing? couldn't you be fizzing? couldn't he be fizzing? couldn't we be fizzing? couldn't you be fizzing? couldn't they be fizzing?
Perfect	V-ing perfect
couldn't I have fizzed? couldn't you have fizzed? couldn't he have fizzed? couldn't we have fizzed? couldn't you have fizzed? couldn't they have fizzed?	couldn't I have been fizzing? couldn't you have been fizzing? couldn't he have been fizzing? couldn't we have been fizzing? couldn't you have been fizzing? couldn't they have been fizzing?