English verb conjugation
COULD SNIVEL

Regular verb: snivel - snivelled - snivelled

Affirmation

Simple form	V-ing form
I could snivel you could snivel she could snivel we could snivel you could snivel they could snivel	I could be snivelling you could be snivelling she could be snivelling we could be snivelling you could be snivelling they could be snivelling
Perfect	V-ing perfect
I could have snivelled you could have snivelled she could have snivelled we could have snivelled you could have snivelled they could have snivelled	I could have been snivelling you could have been snivelling she could have been snivelling we could have been snivelling you could have been snivelling they could have been snivelling

Negation

Simple form	V-ing form
I couldn't snivel you couldn't snivel she couldn't snivel we couldn't snivel you couldn't snivel they couldn't snivel	I couldn't be snivelling you couldn't be snivelling she couldn't be snivelling we couldn't be snivelling you couldn't be snivelling they couldn't be snivelling
Perfect	V-ing perfect
I couldn't have snivelled you couldn't have snivelled she couldn't have snivelled we couldn't have snivelled you couldn't have snivelled they couldn't have snivelled	I couldn't have been snivelling you couldn't have been snivelling she couldn't have been snivelling we couldn't have been snivelling you couldn't have been snivelling they couldn't have been snivelling

Interrogative form

Simple form	V-ing form
could I snivel? could you snivel? could she snivel? could we snivel? could you snivel? could they snivel?	could I be snivelling? could you be snivelling? could she be snivelling? could we be snivelling? could you be snivelling? could they be snivelling?
Perfect	V-ing perfect
could I have snivelled? could you have snivelled? could she have snivelled? could we have snivelled? could you have snivelled? could they have snivelled?	could I have been snivelling? could you have been snivelling? could she have been snivelling? could we have been snivelling? could you have been snivelling? could they have been snivelling?

Interro-negative form

Simple form	V-ing form
couldn't I snivel? couldn't you snivel? couldn't she snivel? couldn't we snivel? couldn't you snivel? couldn't they snivel?	couldn't I be snivelling? couldn't you be snivelling? couldn't she be snivelling? couldn't we be snivelling? couldn't you be snivelling? couldn't they be snivelling?
Perfect	V-ing perfect
couldn't I have snivelled? couldn't you have snivelled? couldn't she have snivelled? couldn't we have snivelled? couldn't you have snivelled? couldn't they have snivelled?	couldn't I have been snivelling? couldn't you have been snivelling? couldn't she have been snivelling? couldn't we have been snivelling? couldn't you have been snivelling? couldn't they have been snivelling?