I could glow you could glow she could glow we could glow you could glow they could glow
V-ing form
I could be glowing you could be glowing she could be glowing we could be glowing you could be glowing they could be glowing
Perfect
I could have glowed you could have glowed she could have glowed we could have glowed you could have glowed they could have glowed
V-ing perfect
I could have been glowing you could have been glowing she could have been glowing we could have been glowing you could have been glowing they could have been glowing
Negation
Simple form
I could not glow you could not glow she could not glow we could not glow you could not glow they could not glow
V-ing form
I could not be glowing you could not be glowing she could not be glowing we could not be glowing you could not be glowing they could not be glowing
Perfect
I could not have glowed you could not have glowed she could not have glowed we could not have glowed you could not have glowed they could not have glowed
V-ing perfect
I could not have been glowing you could not have been glowing she could not have been glowing we could not have been glowing you could not have been glowing they could not have been glowing
Interrogative form
Simple form
could I glow? could you glow? could she glow? could we glow? could you glow? could they glow?
V-ing form
could I be glowing? could you be glowing? could she be glowing? could we be glowing? could you be glowing? could they be glowing?
Perfect
could I have glowed? could you have glowed? could she have glowed? could we have glowed? could you have glowed? could they have glowed?
V-ing perfect
could I have been glowing? could you have been glowing? could she have been glowing? could we have been glowing? could you have been glowing? could they have been glowing?
Interro-negative form
Simple form
could I not glow? could you not glow? could she not glow? could we not glow? could you not glow? could they not glow?
V-ing form
could I not be glowing? could you not be glowing? could she not be glowing? could we not be glowing? could you not be glowing? could they not be glowing?
Perfect
could I not have glowed? could you not have glowed? could she not have glowed? could we not have glowed? could you not have glowed? could they not have glowed?
V-ing perfect
could I not have been glowing? could you not have been glowing? could she not have been glowing? could we not have been glowing? could you not have been glowing? could they not have been glowing?