English verb conjugation
COULD RATTLE

Regular verb: rattle - rattled - rattled

Affirmation

Simple form	V-ing form
I could rattle you could rattle she could rattle we could rattle you could rattle they could rattle	I could be rattling you could be rattling she could be rattling we could be rattling you could be rattling they could be rattling
Perfect	V-ing perfect
I could have rattled you could have rattled she could have rattled we could have rattled you could have rattled they could have rattled	I could have been rattling you could have been rattling she could have been rattling we could have been rattling you could have been rattling they could have been rattling

Negation

Simple form	V-ing form
I could not rattle you could not rattle she could not rattle we could not rattle you could not rattle they could not rattle	I could not be rattling you could not be rattling she could not be rattling we could not be rattling you could not be rattling they could not be rattling
Perfect	V-ing perfect
I could not have rattled you could not have rattled she could not have rattled we could not have rattled you could not have rattled they could not have rattled	I could not have been rattling you could not have been rattling she could not have been rattling we could not have been rattling you could not have been rattling they could not have been rattling

Interrogative form

Simple form	V-ing form
could I rattle? could you rattle? could she rattle? could we rattle? could you rattle? could they rattle?	could I be rattling? could you be rattling? could she be rattling? could we be rattling? could you be rattling? could they be rattling?
Perfect	V-ing perfect
could I have rattled? could you have rattled? could she have rattled? could we have rattled? could you have rattled? could they have rattled?	could I have been rattling? could you have been rattling? could she have been rattling? could we have been rattling? could you have been rattling? could they have been rattling?

Interro-negative form

Simple form	V-ing form
could I not rattle? could you not rattle? could she not rattle? could we not rattle? could you not rattle? could they not rattle?	could I not be rattling? could you not be rattling? could she not be rattling? could we not be rattling? could you not be rattling? could they not be rattling?
Perfect	V-ing perfect
could I not have rattled? could you not have rattled? could she not have rattled? could we not have rattled? could you not have rattled? could they not have rattled?	could I not have been rattling? could you not have been rattling? could she not have been rattling? could we not have been rattling? could you not have been rattling? could they not have been rattling?