English verb conjugation
COULD THORN

Regular verb: thorn - thorned - thorned

Affirmation

Simple form	V-ing form
I could thorn you could thorn he could thorn we could thorn you could thorn they could thorn	I could be thorning you could be thorning he could be thorning we could be thorning you could be thorning they could be thorning
Perfect	V-ing perfect
I could have thorned you could have thorned he could have thorned we could have thorned you could have thorned they could have thorned	I could have been thorning you could have been thorning he could have been thorning we could have been thorning you could have been thorning they could have been thorning

Negation

Simple form	V-ing form
I could not thorn you could not thorn he could not thorn we could not thorn you could not thorn they could not thorn	I could not be thorning you could not be thorning he could not be thorning we could not be thorning you could not be thorning they could not be thorning
Perfect	V-ing perfect
I could not have thorned you could not have thorned he could not have thorned we could not have thorned you could not have thorned they could not have thorned	I could not have been thorning you could not have been thorning he could not have been thorning we could not have been thorning you could not have been thorning they could not have been thorning

Interrogative form

Simple form	V-ing form
could I thorn? could you thorn? could he thorn? could we thorn? could you thorn? could they thorn?	could I be thorning? could you be thorning? could he be thorning? could we be thorning? could you be thorning? could they be thorning?
Perfect	V-ing perfect
could I have thorned? could you have thorned? could he have thorned? could we have thorned? could you have thorned? could they have thorned?	could I have been thorning? could you have been thorning? could he have been thorning? could we have been thorning? could you have been thorning? could they have been thorning?

Interro-negative form

Simple form	V-ing form
could I not thorn? could you not thorn? could he not thorn? could we not thorn? could you not thorn? could they not thorn?	could I not be thorning? could you not be thorning? could he not be thorning? could we not be thorning? could you not be thorning? could they not be thorning?
Perfect	V-ing perfect
could I not have thorned? could you not have thorned? could he not have thorned? could we not have thorned? could you not have thorned? could they not have thorned?	could I not have been thorning? could you not have been thorning? could he not have been thorning? could we not have been thorning? could you not have been thorning? could they not have been thorning?