I could rattle you could rattle he could rattle we could rattle you could rattle they could rattle
V-ing form
I could be rattling you could be rattling he could be rattling we could be rattling you could be rattling they could be rattling
Perfect
I could have rattled you could have rattled he could have rattled we could have rattled you could have rattled they could have rattled
V-ing perfect
I could have been rattling you could have been rattling he could have been rattling we could have been rattling you could have been rattling they could have been rattling
Negation
Simple form
I couldn't rattle you couldn't rattle he couldn't rattle we couldn't rattle you couldn't rattle they couldn't rattle
V-ing form
I couldn't be rattling you couldn't be rattling he couldn't be rattling we couldn't be rattling you couldn't be rattling they couldn't be rattling
Perfect
I couldn't have rattled you couldn't have rattled he couldn't have rattled we couldn't have rattled you couldn't have rattled they couldn't have rattled
V-ing perfect
I couldn't have been rattling you couldn't have been rattling he couldn't have been rattling we couldn't have been rattling you couldn't have been rattling they couldn't have been rattling
Interrogative form
Simple form
could I rattle? could you rattle? could he rattle? could we rattle? could you rattle? could they rattle?
V-ing form
could I be rattling? could you be rattling? could he be rattling? could we be rattling? could you be rattling? could they be rattling?
Perfect
could I have rattled? could you have rattled? could he have rattled? could we have rattled? could you have rattled? could they have rattled?
V-ing perfect
could I have been rattling? could you have been rattling? could he have been rattling? could we have been rattling? could you have been rattling? could they have been rattling?
Interro-negative form
Simple form
couldn't I rattle? couldn't you rattle? couldn't he rattle? couldn't we rattle? couldn't you rattle? couldn't they rattle?
V-ing form
couldn't I be rattling? couldn't you be rattling? couldn't he be rattling? couldn't we be rattling? couldn't you be rattling? couldn't they be rattling?
Perfect
couldn't I have rattled? couldn't you have rattled? couldn't he have rattled? couldn't we have rattled? couldn't you have rattled? couldn't they have rattled?
V-ing perfect
couldn't I have been rattling? couldn't you have been rattling? couldn't he have been rattling? couldn't we have been rattling? couldn't you have been rattling? couldn't they have been rattling?