English verb conjugation
CAN MOURN

Regular verb: mourn - mourned - mourned

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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