I could hasten you could hasten he could hasten we could hasten you could hasten they could hasten
V-ing form
I could be hastening you could be hastening he could be hastening we could be hastening you could be hastening they could be hastening
Perfect
I could have hastened you could have hastened he could have hastened we could have hastened you could have hastened they could have hastened
V-ing perfect
I could have been hastening you could have been hastening he could have been hastening we could have been hastening you could have been hastening they could have been hastening
Negation
Simple form
I could not hasten you could not hasten he could not hasten we could not hasten you could not hasten they could not hasten
V-ing form
I could not be hastening you could not be hastening he could not be hastening we could not be hastening you could not be hastening they could not be hastening
Perfect
I could not have hastened you could not have hastened he could not have hastened we could not have hastened you could not have hastened they could not have hastened
V-ing perfect
I could not have been hastening you could not have been hastening he could not have been hastening we could not have been hastening you could not have been hastening they could not have been hastening
Interrogative form
Simple form
could I hasten? could you hasten? could he hasten? could we hasten? could you hasten? could they hasten?
V-ing form
could I be hastening? could you be hastening? could he be hastening? could we be hastening? could you be hastening? could they be hastening?
Perfect
could I have hastened? could you have hastened? could he have hastened? could we have hastened? could you have hastened? could they have hastened?
V-ing perfect
could I have been hastening? could you have been hastening? could he have been hastening? could we have been hastening? could you have been hastening? could they have been hastening?
Interro-negative form
Simple form
could I not hasten? could you not hasten? could he not hasten? could we not hasten? could you not hasten? could they not hasten?
V-ing form
could I not be hastening? could you not be hastening? could he not be hastening? could we not be hastening? could you not be hastening? could they not be hastening?
Perfect
could I not have hastened? could you not have hastened? could he not have hastened? could we not have hastened? could you not have hastened? could they not have hastened?
V-ing perfect
could I not have been hastening? could you not have been hastening? could he not have been hastening? could we not have been hastening? could you not have been hastening? could they not have been hastening?