English verb conjugation
COULD BACKSTROKE

Regular verb: backstroke - backstroked - backstroked

Affirmation

Simple form	V-ing form
I could backstroke you could backstroke she could backstroke we could backstroke you could backstroke they could backstroke	I could be backstroking you could be backstroking she could be backstroking we could be backstroking you could be backstroking they could be backstroking
Perfect	V-ing perfect
I could have backstroked you could have backstroked she could have backstroked we could have backstroked you could have backstroked they could have backstroked	I could have been backstroking you could have been backstroking she could have been backstroking we could have been backstroking you could have been backstroking they could have been backstroking

Negation

Simple form	V-ing form
I couldn't backstroke you couldn't backstroke she couldn't backstroke we couldn't backstroke you couldn't backstroke they couldn't backstroke	I couldn't be backstroking you couldn't be backstroking she couldn't be backstroking we couldn't be backstroking you couldn't be backstroking they couldn't be backstroking
Perfect	V-ing perfect
I couldn't have backstroked you couldn't have backstroked she couldn't have backstroked we couldn't have backstroked you couldn't have backstroked they couldn't have backstroked	I couldn't have been backstroking you couldn't have been backstroking she couldn't have been backstroking we couldn't have been backstroking you couldn't have been backstroking they couldn't have been backstroking

Interrogative form

Simple form	V-ing form
could I backstroke? could you backstroke? could she backstroke? could we backstroke? could you backstroke? could they backstroke?	could I be backstroking? could you be backstroking? could she be backstroking? could we be backstroking? could you be backstroking? could they be backstroking?
Perfect	V-ing perfect
could I have backstroked? could you have backstroked? could she have backstroked? could we have backstroked? could you have backstroked? could they have backstroked?	could I have been backstroking? could you have been backstroking? could she have been backstroking? could we have been backstroking? could you have been backstroking? could they have been backstroking?

Interro-negative form

Simple form	V-ing form
couldn't I backstroke? couldn't you backstroke? couldn't she backstroke? couldn't we backstroke? couldn't you backstroke? couldn't they backstroke?	couldn't I be backstroking? couldn't you be backstroking? couldn't she be backstroking? couldn't we be backstroking? couldn't you be backstroking? couldn't they be backstroking?
Perfect	V-ing perfect
couldn't I have backstroked? couldn't you have backstroked? couldn't she have backstroked? couldn't we have backstroked? couldn't you have backstroked? couldn't they have backstroked?	couldn't I have been backstroking? couldn't you have been backstroking? couldn't she have been backstroking? couldn't we have been backstroking? couldn't you have been backstroking? couldn't they have been backstroking?