I can clatter you can clatter he can clatter we can clatter you can clatter they can clatter
V-ing form
I can be clattering you can be clattering he can be clattering we can be clattering you can be clattering they can be clattering
Perfect
I can have clattered you can have clattered he can have clattered we can have clattered you can have clattered they can have clattered
V-ing perfect
I can have been clattering you can have been clattering he can have been clattering we can have been clattering you can have been clattering they can have been clattering
Negation
Simple form
I cannot clatter you cannot clatter he cannot clatter we cannot clatter you cannot clatter they cannot clatter
V-ing form
I cannot be clattering you cannot be clattering he cannot be clattering we cannot be clattering you cannot be clattering they cannot be clattering
Perfect
I cannot have clattered you cannot have clattered he cannot have clattered we cannot have clattered you cannot have clattered they cannot have clattered
V-ing perfect
I cannot have been clattering you cannot have been clattering he cannot have been clattering we cannot have been clattering you cannot have been clattering they cannot have been clattering
Interrogative form
Simple form
can I clatter? can you clatter? can he clatter? can we clatter? can you clatter? can they clatter?
V-ing form
can I be clattering? can you be clattering? can he be clattering? can we be clattering? can you be clattering? can they be clattering?
Perfect
can I have clattered? can you have clattered? can he have clattered? can we have clattered? can you have clattered? can they have clattered?
V-ing perfect
can I have been clattering? can you have been clattering? can he have been clattering? can we have been clattering? can you have been clattering? can they have been clattering?
Interro-negative form
Simple form
can I not clatter? can you not clatter? can he not clatter? can we not clatter? can you not clatter? can they not clatter?
V-ing form
can I not be clattering? can you not be clattering? can he not be clattering? can we not be clattering? can you not be clattering? can they not be clattering?
Perfect
can I not have clattered? can you not have clattered? can he not have clattered? can we not have clattered? can you not have clattered? can they not have clattered?
V-ing perfect
can I not have been clattering? can you not have been clattering? can he not have been clattering? can we not have been clattering? can you not have been clattering? can they not have been clattering?