English verb conjugation
COULD STROKE

Regular verb: stroke - stroked - stroked

Affirmation

Simple form	V-ing form
I could stroke you could stroke he could stroke we could stroke you could stroke they could stroke	I could be stroking you could be stroking he could be stroking we could be stroking you could be stroking they could be stroking
Perfect	V-ing perfect
I could have stroked you could have stroked he could have stroked we could have stroked you could have stroked they could have stroked	I could have been stroking you could have been stroking he could have been stroking we could have been stroking you could have been stroking they could have been stroking

Negation

Simple form	V-ing form
I couldn't stroke you couldn't stroke he couldn't stroke we couldn't stroke you couldn't stroke they couldn't stroke	I couldn't be stroking you couldn't be stroking he couldn't be stroking we couldn't be stroking you couldn't be stroking they couldn't be stroking
Perfect	V-ing perfect
I couldn't have stroked you couldn't have stroked he couldn't have stroked we couldn't have stroked you couldn't have stroked they couldn't have stroked	I couldn't have been stroking you couldn't have been stroking he couldn't have been stroking we couldn't have been stroking you couldn't have been stroking they couldn't have been stroking

Interrogative form

Simple form	V-ing form
could I stroke? could you stroke? could he stroke? could we stroke? could you stroke? could they stroke?	could I be stroking? could you be stroking? could he be stroking? could we be stroking? could you be stroking? could they be stroking?
Perfect	V-ing perfect
could I have stroked? could you have stroked? could he have stroked? could we have stroked? could you have stroked? could they have stroked?	could I have been stroking? could you have been stroking? could he have been stroking? could we have been stroking? could you have been stroking? could they have been stroking?

Interro-negative form

Simple form	V-ing form
couldn't I stroke? couldn't you stroke? couldn't he stroke? couldn't we stroke? couldn't you stroke? couldn't they stroke?	couldn't I be stroking? couldn't you be stroking? couldn't he be stroking? couldn't we be stroking? couldn't you be stroking? couldn't they be stroking?
Perfect	V-ing perfect
couldn't I have stroked? couldn't you have stroked? couldn't he have stroked? couldn't we have stroked? couldn't you have stroked? couldn't they have stroked?	couldn't I have been stroking? couldn't you have been stroking? couldn't he have been stroking? couldn't we have been stroking? couldn't you have been stroking? couldn't they have been stroking?