I could half-mast you could half-mast he could half-mast we could half-mast you could half-mast they could half-mast
V-ing form
I could be half-masting you could be half-masting he could be half-masting we could be half-masting you could be half-masting they could be half-masting
Perfect
I could have half-masted you could have half-masted he could have half-masted we could have half-masted you could have half-masted they could have half-masted
V-ing perfect
I could have been half-masting you could have been half-masting he could have been half-masting we could have been half-masting you could have been half-masting they could have been half-masting
Negation
Simple form
I could not half-mast you could not half-mast he could not half-mast we could not half-mast you could not half-mast they could not half-mast
V-ing form
I could not be half-masting you could not be half-masting he could not be half-masting we could not be half-masting you could not be half-masting they could not be half-masting
Perfect
I could not have half-masted you could not have half-masted he could not have half-masted we could not have half-masted you could not have half-masted they could not have half-masted
V-ing perfect
I could not have been half-masting you could not have been half-masting he could not have been half-masting we could not have been half-masting you could not have been half-masting they could not have been half-masting
Interrogative form
Simple form
could I half-mast? could you half-mast? could he half-mast? could we half-mast? could you half-mast? could they half-mast?
V-ing form
could I be half-masting? could you be half-masting? could he be half-masting? could we be half-masting? could you be half-masting? could they be half-masting?
Perfect
could I have half-masted? could you have half-masted? could he have half-masted? could we have half-masted? could you have half-masted? could they have half-masted?
V-ing perfect
could I have been half-masting? could you have been half-masting? could he have been half-masting? could we have been half-masting? could you have been half-masting? could they have been half-masting?
Interro-negative form
Simple form
could I not half-mast? could you not half-mast? could he not half-mast? could we not half-mast? could you not half-mast? could they not half-mast?
V-ing form
could I not be half-masting? could you not be half-masting? could he not be half-masting? could we not be half-masting? could you not be half-masting? could they not be half-masting?
Perfect
could I not have half-masted? could you not have half-masted? could he not have half-masted? could we not have half-masted? could you not have half-masted? could they not have half-masted?
V-ing perfect
could I not have been half-masting? could you not have been half-masting? could he not have been half-masting? could we not have been half-masting? could you not have been half-masting? could they not have been half-masting?