English verb conjugation
COULD CLATTER

Regular verb: clatter - clattered - clattered

Affirmation

Simple form	V-ing form
I could clatter you could clatter he could clatter we could clatter you could clatter they could clatter	I could be clattering you could be clattering he could be clattering we could be clattering you could be clattering they could be clattering
Perfect	V-ing perfect
I could have clattered you could have clattered he could have clattered we could have clattered you could have clattered they could have clattered	I could have been clattering you could have been clattering he could have been clattering we could have been clattering you could have been clattering they could have been clattering

Negation

Simple form	V-ing form
I could not clatter you could not clatter he could not clatter we could not clatter you could not clatter they could not clatter	I could not be clattering you could not be clattering he could not be clattering we could not be clattering you could not be clattering they could not be clattering
Perfect	V-ing perfect
I could not have clattered you could not have clattered he could not have clattered we could not have clattered you could not have clattered they could not have clattered	I could not have been clattering you could not have been clattering he could not have been clattering we could not have been clattering you could not have been clattering they could not have been clattering

Interrogative form

Simple form	V-ing form
could I clatter? could you clatter? could he clatter? could we clatter? could you clatter? could they clatter?	could I be clattering? could you be clattering? could he be clattering? could we be clattering? could you be clattering? could they be clattering?
Perfect	V-ing perfect
could I have clattered? could you have clattered? could he have clattered? could we have clattered? could you have clattered? could they have clattered?	could I have been clattering? could you have been clattering? could he have been clattering? could we have been clattering? could you have been clattering? could they have been clattering?

Interro-negative form

Simple form	V-ing form
could I not clatter? could you not clatter? could he not clatter? could we not clatter? could you not clatter? could they not clatter?	could I not be clattering? could you not be clattering? could he not be clattering? could we not be clattering? could you not be clattering? could they not be clattering?
Perfect	V-ing perfect
could I not have clattered? could you not have clattered? could he not have clattered? could we not have clattered? could you not have clattered? could they not have clattered?	could I not have been clattering? could you not have been clattering? could he not have been clattering? could we not have been clattering? could you not have been clattering? could they not have been clattering?