I could overcast you could overcast she could overcast we could overcast you could overcast they could overcast
V-ing form
I could be overcasting you could be overcasting she could be overcasting we could be overcasting you could be overcasting they could be overcasting
Perfect
I could have overcasted you could have overcasted she could have overcasted we could have overcasted you could have overcasted they could have overcasted
V-ing perfect
I could have been overcasting you could have been overcasting she could have been overcasting we could have been overcasting you could have been overcasting they could have been overcasting
Negation
Simple form
I could not overcast you could not overcast she could not overcast we could not overcast you could not overcast they could not overcast
V-ing form
I could not be overcasting you could not be overcasting she could not be overcasting we could not be overcasting you could not be overcasting they could not be overcasting
Perfect
I could not have overcasted you could not have overcasted she could not have overcasted we could not have overcasted you could not have overcasted they could not have overcasted
V-ing perfect
I could not have been overcasting you could not have been overcasting she could not have been overcasting we could not have been overcasting you could not have been overcasting they could not have been overcasting
Interrogative form
Simple form
could I overcast? could you overcast? could she overcast? could we overcast? could you overcast? could they overcast?
V-ing form
could I be overcasting? could you be overcasting? could she be overcasting? could we be overcasting? could you be overcasting? could they be overcasting?
Perfect
could I have overcasted? could you have overcasted? could she have overcasted? could we have overcasted? could you have overcasted? could they have overcasted?
V-ing perfect
could I have been overcasting? could you have been overcasting? could she have been overcasting? could we have been overcasting? could you have been overcasting? could they have been overcasting?
Interro-negative form
Simple form
could I not overcast? could you not overcast? could she not overcast? could we not overcast? could you not overcast? could they not overcast?
V-ing form
could I not be overcasting? could you not be overcasting? could she not be overcasting? could we not be overcasting? could you not be overcasting? could they not be overcasting?
Perfect
could I not have overcasted? could you not have overcasted? could she not have overcasted? could we not have overcasted? could you not have overcasted? could they not have overcasted?
V-ing perfect
could I not have been overcasting? could you not have been overcasting? could she not have been overcasting? could we not have been overcasting? could you not have been overcasting? could they not have been overcasting?