English verb conjugation
COULD THORN

Regular verb: thorn - thorned - thorned

Affirmation

Simple form	V-ing form
I could thorn you could thorn she could thorn we could thorn you could thorn they could thorn	I could be thorning you could be thorning she 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 she 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 she 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 couldn't thorn you couldn't thorn she couldn't thorn we couldn't thorn you couldn't thorn they couldn't thorn	I couldn't be thorning you couldn't be thorning she couldn't be thorning we couldn't be thorning you couldn't be thorning they couldn't be thorning
Perfect	V-ing perfect
I couldn't have thorned you couldn't have thorned she couldn't have thorned we couldn't have thorned you couldn't have thorned they couldn't have thorned	I couldn't have been thorning you couldn't have been thorning she couldn't have been thorning we couldn't have been thorning you couldn't have been thorning they couldn't have been thorning

Interrogative form

Simple form	V-ing form
could I thorn? could you thorn? could she thorn? could we thorn? could you thorn? could they thorn?	could I be thorning? could you be thorning? could she 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 she 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 she 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
couldn't I thorn? couldn't you thorn? couldn't she thorn? couldn't we thorn? couldn't you thorn? couldn't they thorn?	couldn't I be thorning? couldn't you be thorning? couldn't she be thorning? couldn't we be thorning? couldn't you be thorning? couldn't they be thorning?
Perfect	V-ing perfect
couldn't I have thorned? couldn't you have thorned? couldn't she have thorned? couldn't we have thorned? couldn't you have thorned? couldn't they have thorned?	couldn't I have been thorning? couldn't you have been thorning? couldn't she have been thorning? couldn't we have been thorning? couldn't you have been thorning? couldn't they have been thorning?