English verb conjugation
COULD MOURN

Regular verb: mourn - mourned - mourned

Affirmation

Simple form	V-ing form
I could mourn you could mourn he could mourn we could mourn you could mourn they could mourn	I could be mourning you could be mourning he could be mourning we could be mourning you could be mourning they could be mourning
Perfect	V-ing perfect
I could have mourned you could have mourned he could have mourned we could have mourned you could have mourned they could have mourned	I could have been mourning you could have been mourning he could have been mourning we could have been mourning you could have been mourning they could have been mourning

Negation

Simple form	V-ing form
I couldn't mourn you couldn't mourn he couldn't mourn we couldn't mourn you couldn't mourn they couldn't mourn	I couldn't be mourning you couldn't be mourning he couldn't be mourning we couldn't be mourning you couldn't be mourning they couldn't be mourning
Perfect	V-ing perfect
I couldn't have mourned you couldn't have mourned he couldn't have mourned we couldn't have mourned you couldn't have mourned they couldn't have mourned	I couldn't have been mourning you couldn't have been mourning he couldn't have been mourning we couldn't have been mourning you couldn't have been mourning they couldn't have been mourning

Interrogative form

Simple form	V-ing form
could I mourn? could you mourn? could he mourn? could we mourn? could you mourn? could they mourn?	could I be mourning? could you be mourning? could he be mourning? could we be mourning? could you be mourning? could they be mourning?
Perfect	V-ing perfect
could I have mourned? could you have mourned? could he have mourned? could we have mourned? could you have mourned? could they have mourned?	could I have been mourning? could you have been mourning? could he have been mourning? could we have been mourning? could you have been mourning? could they have been mourning?

Interro-negative form

Simple form	V-ing form
couldn't I mourn? couldn't you mourn? couldn't he mourn? couldn't we mourn? couldn't you mourn? couldn't they mourn?	couldn't I be mourning? couldn't you be mourning? couldn't he be mourning? couldn't we be mourning? couldn't you be mourning? couldn't they be mourning?
Perfect	V-ing perfect
couldn't I have mourned? couldn't you have mourned? couldn't he have mourned? couldn't we have mourned? couldn't you have mourned? couldn't they have mourned?	couldn't I have been mourning? couldn't you have been mourning? couldn't he have been mourning? couldn't we have been mourning? couldn't you have been mourning? couldn't they have been mourning?