English verb conjugation
COULD STAIR-STEP

Regular verb: stair-step - stair-steped - stair-steped

Affirmation

Simple form	V-ing form
I could stair-step you could stair-step he could stair-step we could stair-step you could stair-step they could stair-step	I could be stair-steping you could be stair-steping he could be stair-steping we could be stair-steping you could be stair-steping they could be stair-steping
Perfect	V-ing perfect
I could have stair-steped you could have stair-steped he could have stair-steped we could have stair-steped you could have stair-steped they could have stair-steped	I could have been stair-steping you could have been stair-steping he could have been stair-steping we could have been stair-steping you could have been stair-steping they could have been stair-steping

Negation

Simple form	V-ing form
I couldn't stair-step you couldn't stair-step he couldn't stair-step we couldn't stair-step you couldn't stair-step they couldn't stair-step	I couldn't be stair-steping you couldn't be stair-steping he couldn't be stair-steping we couldn't be stair-steping you couldn't be stair-steping they couldn't be stair-steping
Perfect	V-ing perfect
I couldn't have stair-steped you couldn't have stair-steped he couldn't have stair-steped we couldn't have stair-steped you couldn't have stair-steped they couldn't have stair-steped	I couldn't have been stair-steping you couldn't have been stair-steping he couldn't have been stair-steping we couldn't have been stair-steping you couldn't have been stair-steping they couldn't have been stair-steping

Interrogative form

Simple form	V-ing form
could I stair-step? could you stair-step? could he stair-step? could we stair-step? could you stair-step? could they stair-step?	could I be stair-steping? could you be stair-steping? could he be stair-steping? could we be stair-steping? could you be stair-steping? could they be stair-steping?
Perfect	V-ing perfect
could I have stair-steped? could you have stair-steped? could he have stair-steped? could we have stair-steped? could you have stair-steped? could they have stair-steped?	could I have been stair-steping? could you have been stair-steping? could he have been stair-steping? could we have been stair-steping? could you have been stair-steping? could they have been stair-steping?

Interro-negative form

Simple form	V-ing form
couldn't I stair-step? couldn't you stair-step? couldn't he stair-step? couldn't we stair-step? couldn't you stair-step? couldn't they stair-step?	couldn't I be stair-steping? couldn't you be stair-steping? couldn't he be stair-steping? couldn't we be stair-steping? couldn't you be stair-steping? couldn't they be stair-steping?
Perfect	V-ing perfect
couldn't I have stair-steped? couldn't you have stair-steped? couldn't he have stair-steped? couldn't we have stair-steped? couldn't you have stair-steped? couldn't they have stair-steped?	couldn't I have been stair-steping? couldn't you have been stair-steping? couldn't he have been stair-steping? couldn't we have been stair-steping? couldn't you have been stair-steping? couldn't they have been stair-steping?