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 couldn't thorn you couldn't thorn he 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 he 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 he 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 he 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 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
couldn't I thorn? couldn't you thorn? couldn't he 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 he 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 he 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 he have been thorning? couldn't we have been thorning? couldn't you have been thorning? couldn't they have been thorning?