I could haste you could haste she could haste we could haste you could haste they could haste
V-ing form
I could be hasting you could be hasting she could be hasting we could be hasting you could be hasting they could be hasting
Perfect
I could have hasted you could have hasted she 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 she could have been hasting we could have been hasting you could have been hasting they could have been hasting
Negation
Simple form
I couldn't haste you couldn't haste she couldn't haste we couldn't haste you couldn't haste they couldn't haste
V-ing form
I couldn't be hasting you couldn't be hasting she couldn't be hasting we couldn't be hasting you couldn't be hasting they couldn't be hasting
Perfect
I couldn't have hasted you couldn't have hasted she couldn't have hasted we couldn't have hasted you couldn't have hasted they couldn't have hasted
V-ing perfect
I couldn't have been hasting you couldn't have been hasting she couldn't have been hasting we couldn't have been hasting you couldn't have been hasting they couldn't have been hasting
Interrogative form
Simple form
could I haste? could you haste? could she haste? could we haste? could you haste? could they haste?
V-ing form
could I be hasting? could you be hasting? could she be hasting? could we be hasting? could you be hasting? could they be hasting?
Perfect
could I have hasted? could you have hasted? could she 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 she have been hasting? could we have been hasting? could you have been hasting? could they have been hasting?
Interro-negative form
Simple form
couldn't I haste? couldn't you haste? couldn't she haste? couldn't we haste? couldn't you haste? couldn't they haste?
V-ing form
couldn't I be hasting? couldn't you be hasting? couldn't she be hasting? couldn't we be hasting? couldn't you be hasting? couldn't they be hasting?
Perfect
couldn't I have hasted? couldn't you have hasted? couldn't she have hasted? couldn't we have hasted? couldn't you have hasted? couldn't they have hasted?
V-ing perfect
couldn't I have been hasting? couldn't you have been hasting? couldn't she have been hasting? couldn't we have been hasting? couldn't you have been hasting? couldn't they have been hasting?