I could halter you could halter he could halter we could halter you could halter they could halter
V-ing form
I could be haltering you could be haltering he could be haltering we could be haltering you could be haltering they could be haltering
Perfect
I could have haltered you could have haltered he could have haltered we could have haltered you could have haltered they could have haltered
V-ing perfect
I could have been haltering you could have been haltering he could have been haltering we could have been haltering you could have been haltering they could have been haltering
Negation
Simple form
I could not halter you could not halter he could not halter we could not halter you could not halter they could not halter
V-ing form
I could not be haltering you could not be haltering he could not be haltering we could not be haltering you could not be haltering they could not be haltering
Perfect
I could not have haltered you could not have haltered he could not have haltered we could not have haltered you could not have haltered they could not have haltered
V-ing perfect
I could not have been haltering you could not have been haltering he could not have been haltering we could not have been haltering you could not have been haltering they could not have been haltering
Interrogative form
Simple form
could I halter? could you halter? could he halter? could we halter? could you halter? could they halter?
V-ing form
could I be haltering? could you be haltering? could he be haltering? could we be haltering? could you be haltering? could they be haltering?
Perfect
could I have haltered? could you have haltered? could he have haltered? could we have haltered? could you have haltered? could they have haltered?
V-ing perfect
could I have been haltering? could you have been haltering? could he have been haltering? could we have been haltering? could you have been haltering? could they have been haltering?
Interro-negative form
Simple form
could I not halter? could you not halter? could he not halter? could we not halter? could you not halter? could they not halter?
V-ing form
could I not be haltering? could you not be haltering? could he not be haltering? could we not be haltering? could you not be haltering? could they not be haltering?
Perfect
could I not have haltered? could you not have haltered? could he not have haltered? could we not have haltered? could you not have haltered? could they not have haltered?
V-ing perfect
could I not have been haltering? could you not have been haltering? could he not have been haltering? could we not have been haltering? could you not have been haltering? could they not have been haltering?