I could gloss you could gloss she could gloss we could gloss you could gloss they could gloss
V-ing form
I could be glossing you could be glossing she could be glossing we could be glossing you could be glossing they could be glossing
Perfect
I could have glossed you could have glossed she could have glossed we could have glossed you could have glossed they could have glossed
V-ing perfect
I could have been glossing you could have been glossing she could have been glossing we could have been glossing you could have been glossing they could have been glossing
Negation
Simple form
I could not gloss you could not gloss she could not gloss we could not gloss you could not gloss they could not gloss
V-ing form
I could not be glossing you could not be glossing she could not be glossing we could not be glossing you could not be glossing they could not be glossing
Perfect
I could not have glossed you could not have glossed she could not have glossed we could not have glossed you could not have glossed they could not have glossed
V-ing perfect
I could not have been glossing you could not have been glossing she could not have been glossing we could not have been glossing you could not have been glossing they could not have been glossing
Interrogative form
Simple form
could I gloss? could you gloss? could she gloss? could we gloss? could you gloss? could they gloss?
V-ing form
could I be glossing? could you be glossing? could she be glossing? could we be glossing? could you be glossing? could they be glossing?
Perfect
could I have glossed? could you have glossed? could she have glossed? could we have glossed? could you have glossed? could they have glossed?
V-ing perfect
could I have been glossing? could you have been glossing? could she have been glossing? could we have been glossing? could you have been glossing? could they have been glossing?
Interro-negative form
Simple form
could I not gloss? could you not gloss? could she not gloss? could we not gloss? could you not gloss? could they not gloss?
V-ing form
could I not be glossing? could you not be glossing? could she not be glossing? could we not be glossing? could you not be glossing? could they not be glossing?
Perfect
could I not have glossed? could you not have glossed? could she not have glossed? could we not have glossed? could you not have glossed? could they not have glossed?
V-ing perfect
could I not have been glossing? could you not have been glossing? could she not have been glossing? could we not have been glossing? could you not have been glossing? could they not have been glossing?