I could weep you could weep he could weep we could weep you could weep they could weep
V-ing form
I could be weeping you could be weeping he could be weeping we could be weeping you could be weeping they could be weeping
Perfect
I could have wept you could have wept he could have wept we could have wept you could have wept they could have wept
V-ing perfect
I could have been weeping you could have been weeping he could have been weeping we could have been weeping you could have been weeping they could have been weeping
Negation
Simple form
I could not weep you could not weep he could not weep we could not weep you could not weep they could not weep
V-ing form
I could not be weeping you could not be weeping he could not be weeping we could not be weeping you could not be weeping they could not be weeping
Perfect
I could not have wept you could not have wept he could not have wept we could not have wept you could not have wept they could not have wept
V-ing perfect
I could not have been weeping you could not have been weeping he could not have been weeping we could not have been weeping you could not have been weeping they could not have been weeping
Interrogative form
Simple form
could I weep? could you weep? could he weep? could we weep? could you weep? could they weep?
V-ing form
could I be weeping? could you be weeping? could he be weeping? could we be weeping? could you be weeping? could they be weeping?
Perfect
could I have wept? could you have wept? could he have wept? could we have wept? could you have wept? could they have wept?
V-ing perfect
could I have been weeping? could you have been weeping? could he have been weeping? could we have been weeping? could you have been weeping? could they have been weeping?
Interro-negative form
Simple form
could I not weep? could you not weep? could he not weep? could we not weep? could you not weep? could they not weep?
V-ing form
could I not be weeping? could you not be weeping? could he not be weeping? could we not be weeping? could you not be weeping? could they not be weeping?
Perfect
could I not have wept? could you not have wept? could he not have wept? could we not have wept? could you not have wept? could they not have wept?
V-ing perfect
could I not have been weeping? could you not have been weeping? could he not have been weeping? could we not have been weeping? could you not have been weeping? could they not have been weeping?