I can mar you can mar he can mar we can mar you can mar they can mar
V-ing form
I can be marring you can be marring he can be marring we can be marring you can be marring they can be marring
Perfect
I can have marred you can have marred he can have marred we can have marred you can have marred they can have marred
V-ing perfect
I can have been marring you can have been marring he can have been marring we can have been marring you can have been marring they can have been marring
Negation
Simple form
I can't mar you can't mar he can't mar we can't mar you can't mar they can't mar
V-ing form
I can't be marring you can't be marring he can't be marring we can't be marring you can't be marring they can't be marring
Perfect
I can't have marred you can't have marred he can't have marred we can't have marred you can't have marred they can't have marred
V-ing perfect
I can't have been marring you can't have been marring he can't have been marring we can't have been marring you can't have been marring they can't have been marring
Interrogative form
Simple form
can I mar? can you mar? can he mar? can we mar? can you mar? can they mar?
V-ing form
can I be marring? can you be marring? can he be marring? can we be marring? can you be marring? can they be marring?
Perfect
can I have marred? can you have marred? can he have marred? can we have marred? can you have marred? can they have marred?
V-ing perfect
can I have been marring? can you have been marring? can he have been marring? can we have been marring? can you have been marring? can they have been marring?
Interro-negative form
Simple form
can't I mar? can't you mar? can't he mar? can't we mar? can't you mar? can't they mar?
V-ing form
can't I be marring? can't you be marring? can't he be marring? can't we be marring? can't you be marring? can't they be marring?
Perfect
can't I have marred? can't you have marred? can't he have marred? can't we have marred? can't you have marred? can't they have marred?
V-ing perfect
can't I have been marring? can't you have been marring? can't he have been marring? can't we have been marring? can't you have been marring? can't they have been marring?