I could sediment you could sediment he could sediment we could sediment you could sediment they could sediment
V-ing form
I could be sedimenting you could be sedimenting he could be sedimenting we could be sedimenting you could be sedimenting they could be sedimenting
Perfect
I could have sedimented you could have sedimented he could have sedimented we could have sedimented you could have sedimented they could have sedimented
V-ing perfect
I could have been sedimenting you could have been sedimenting he could have been sedimenting we could have been sedimenting you could have been sedimenting they could have been sedimenting
Negation
Simple form
I could not sediment you could not sediment he could not sediment we could not sediment you could not sediment they could not sediment
V-ing form
I could not be sedimenting you could not be sedimenting he could not be sedimenting we could not be sedimenting you could not be sedimenting they could not be sedimenting
Perfect
I could not have sedimented you could not have sedimented he could not have sedimented we could not have sedimented you could not have sedimented they could not have sedimented
V-ing perfect
I could not have been sedimenting you could not have been sedimenting he could not have been sedimenting we could not have been sedimenting you could not have been sedimenting they could not have been sedimenting
Interrogative form
Simple form
could I sediment? could you sediment? could he sediment? could we sediment? could you sediment? could they sediment?
V-ing form
could I be sedimenting? could you be sedimenting? could he be sedimenting? could we be sedimenting? could you be sedimenting? could they be sedimenting?
Perfect
could I have sedimented? could you have sedimented? could he have sedimented? could we have sedimented? could you have sedimented? could they have sedimented?
V-ing perfect
could I have been sedimenting? could you have been sedimenting? could he have been sedimenting? could we have been sedimenting? could you have been sedimenting? could they have been sedimenting?
Interro-negative form
Simple form
could I not sediment? could you not sediment? could he not sediment? could we not sediment? could you not sediment? could they not sediment?
V-ing form
could I not be sedimenting? could you not be sedimenting? could he not be sedimenting? could we not be sedimenting? could you not be sedimenting? could they not be sedimenting?
Perfect
could I not have sedimented? could you not have sedimented? could he not have sedimented? could we not have sedimented? could you not have sedimented? could they not have sedimented?
V-ing perfect
could I not have been sedimenting? could you not have been sedimenting? could he not have been sedimenting? could we not have been sedimenting? could you not have been sedimenting? could they not have been sedimenting?