English verb conjugation
COULD STONE

Regular verb: stone - stoned - stoned

Affirmation

Simple form	V-ing form
I could stone you could stone he could stone we could stone you could stone they could stone	I could be stoning you could be stoning he could be stoning we could be stoning you could be stoning they could be stoning
Perfect	V-ing perfect
I could have stoned you could have stoned he could have stoned we could have stoned you could have stoned they could have stoned	I could have been stoning you could have been stoning he could have been stoning we could have been stoning you could have been stoning they could have been stoning

Negation

Simple form	V-ing form
I couldn't stone you couldn't stone he couldn't stone we couldn't stone you couldn't stone they couldn't stone	I couldn't be stoning you couldn't be stoning he couldn't be stoning we couldn't be stoning you couldn't be stoning they couldn't be stoning
Perfect	V-ing perfect
I couldn't have stoned you couldn't have stoned he couldn't have stoned we couldn't have stoned you couldn't have stoned they couldn't have stoned	I couldn't have been stoning you couldn't have been stoning he couldn't have been stoning we couldn't have been stoning you couldn't have been stoning they couldn't have been stoning

Interrogative form

Simple form	V-ing form
could I stone? could you stone? could he stone? could we stone? could you stone? could they stone?	could I be stoning? could you be stoning? could he be stoning? could we be stoning? could you be stoning? could they be stoning?
Perfect	V-ing perfect
could I have stoned? could you have stoned? could he have stoned? could we have stoned? could you have stoned? could they have stoned?	could I have been stoning? could you have been stoning? could he have been stoning? could we have been stoning? could you have been stoning? could they have been stoning?

Interro-negative form

Simple form	V-ing form
couldn't I stone? couldn't you stone? couldn't he stone? couldn't we stone? couldn't you stone? couldn't they stone?	couldn't I be stoning? couldn't you be stoning? couldn't he be stoning? couldn't we be stoning? couldn't you be stoning? couldn't they be stoning?
Perfect	V-ing perfect
couldn't I have stoned? couldn't you have stoned? couldn't he have stoned? couldn't we have stoned? couldn't you have stoned? couldn't they have stoned?	couldn't I have been stoning? couldn't you have been stoning? couldn't he have been stoning? couldn't we have been stoning? couldn't you have been stoning? couldn't they have been stoning?