I could haste you could haste he could haste we could haste you could haste they could haste
V-ing form
I could be hasting you could be hasting he could be hasting we could be hasting you could be hasting they could be hasting
Perfect
I could have hasted you could have hasted he could have hasted we could have hasted you could have hasted they could have hasted
V-ing perfect
I could have been hasting you could have been hasting he could have been hasting we could have been hasting you could have been hasting they could have been hasting
Negation
Simple form
I could not haste you could not haste he could not haste we could not haste you could not haste they could not haste
V-ing form
I could not be hasting you could not be hasting he could not be hasting we could not be hasting you could not be hasting they could not be hasting
Perfect
I could not have hasted you could not have hasted he could not have hasted we could not have hasted you could not have hasted they could not have hasted
V-ing perfect
I could not have been hasting you could not have been hasting he could not have been hasting we could not have been hasting you could not have been hasting they could not have been hasting
Interrogative form
Simple form
could I haste? could you haste? could he haste? could we haste? could you haste? could they haste?
V-ing form
could I be hasting? could you be hasting? could he be hasting? could we be hasting? could you be hasting? could they be hasting?
Perfect
could I have hasted? could you have hasted? could he have hasted? could we have hasted? could you have hasted? could they have hasted?
V-ing perfect
could I have been hasting? could you have been hasting? could he have been hasting? could we have been hasting? could you have been hasting? could they have been hasting?
Interro-negative form
Simple form
could I not haste? could you not haste? could he not haste? could we not haste? could you not haste? could they not haste?
V-ing form
could I not be hasting? could you not be hasting? could he not be hasting? could we not be hasting? could you not be hasting? could they not be hasting?
Perfect
could I not have hasted? could you not have hasted? could he not have hasted? could we not have hasted? could you not have hasted? could they not have hasted?
V-ing perfect
could I not have been hasting? could you not have been hasting? could he not have been hasting? could we not have been hasting? could you not have been hasting? could they not have been hasting?