I can clutter you can clutter he can clutter we can clutter you can clutter they can clutter
V-ing form
I can be cluttering you can be cluttering he can be cluttering we can be cluttering you can be cluttering they can be cluttering
Perfect
I can have cluttered you can have cluttered he can have cluttered we can have cluttered you can have cluttered they can have cluttered
V-ing perfect
I can have been cluttering you can have been cluttering he can have been cluttering we can have been cluttering you can have been cluttering they can have been cluttering
Negation
Simple form
I can't clutter you can't clutter he can't clutter we can't clutter you can't clutter they can't clutter
V-ing form
I can't be cluttering you can't be cluttering he can't be cluttering we can't be cluttering you can't be cluttering they can't be cluttering
Perfect
I can't have cluttered you can't have cluttered he can't have cluttered we can't have cluttered you can't have cluttered they can't have cluttered
V-ing perfect
I can't have been cluttering you can't have been cluttering he can't have been cluttering we can't have been cluttering you can't have been cluttering they can't have been cluttering
Interrogative form
Simple form
can I clutter? can you clutter? can he clutter? can we clutter? can you clutter? can they clutter?
V-ing form
can I be cluttering? can you be cluttering? can he be cluttering? can we be cluttering? can you be cluttering? can they be cluttering?
Perfect
can I have cluttered? can you have cluttered? can he have cluttered? can we have cluttered? can you have cluttered? can they have cluttered?
V-ing perfect
can I have been cluttering? can you have been cluttering? can he have been cluttering? can we have been cluttering? can you have been cluttering? can they have been cluttering?
Interro-negative form
Simple form
can't I clutter? can't you clutter? can't he clutter? can't we clutter? can't you clutter? can't they clutter?
V-ing form
can't I be cluttering? can't you be cluttering? can't he be cluttering? can't we be cluttering? can't you be cluttering? can't they be cluttering?
Perfect
can't I have cluttered? can't you have cluttered? can't he have cluttered? can't we have cluttered? can't you have cluttered? can't they have cluttered?
V-ing perfect
can't I have been cluttering? can't you have been cluttering? can't he have been cluttering? can't we have been cluttering? can't you have been cluttering? can't they have been cluttering?