I could refresh you could refresh he could refresh we could refresh you could refresh they could refresh
V-ing form
I could be refreshing you could be refreshing he could be refreshing we could be refreshing you could be refreshing they could be refreshing
Perfect
I could have refreshed you could have refreshed he could have refreshed we could have refreshed you could have refreshed they could have refreshed
V-ing perfect
I could have been refreshing you could have been refreshing he could have been refreshing we could have been refreshing you could have been refreshing they could have been refreshing
Negation
Simple form
I couldn't refresh you couldn't refresh he couldn't refresh we couldn't refresh you couldn't refresh they couldn't refresh
V-ing form
I couldn't be refreshing you couldn't be refreshing he couldn't be refreshing we couldn't be refreshing you couldn't be refreshing they couldn't be refreshing
Perfect
I couldn't have refreshed you couldn't have refreshed he couldn't have refreshed we couldn't have refreshed you couldn't have refreshed they couldn't have refreshed
V-ing perfect
I couldn't have been refreshing you couldn't have been refreshing he couldn't have been refreshing we couldn't have been refreshing you couldn't have been refreshing they couldn't have been refreshing
Interrogative form
Simple form
could I refresh? could you refresh? could he refresh? could we refresh? could you refresh? could they refresh?
V-ing form
could I be refreshing? could you be refreshing? could he be refreshing? could we be refreshing? could you be refreshing? could they be refreshing?
Perfect
could I have refreshed? could you have refreshed? could he have refreshed? could we have refreshed? could you have refreshed? could they have refreshed?
V-ing perfect
could I have been refreshing? could you have been refreshing? could he have been refreshing? could we have been refreshing? could you have been refreshing? could they have been refreshing?
Interro-negative form
Simple form
couldn't I refresh? couldn't you refresh? couldn't he refresh? couldn't we refresh? couldn't you refresh? couldn't they refresh?
V-ing form
couldn't I be refreshing? couldn't you be refreshing? couldn't he be refreshing? couldn't we be refreshing? couldn't you be refreshing? couldn't they be refreshing?
Perfect
couldn't I have refreshed? couldn't you have refreshed? couldn't he have refreshed? couldn't we have refreshed? couldn't you have refreshed? couldn't they have refreshed?
V-ing perfect
couldn't I have been refreshing? couldn't you have been refreshing? couldn't he have been refreshing? couldn't we have been refreshing? couldn't you have been refreshing? couldn't they have been refreshing?