I could refresh you could refresh she could refresh we could refresh you could refresh they could refresh
V-ing form
I could be refreshing you could be refreshing she could be refreshing we could be refreshing you could be refreshing they could be refreshing
Perfect
I could have refreshed you could have refreshed she 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 she 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 she 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 she 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 she 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 she 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 she refresh? could we refresh? could you refresh? could they refresh?
V-ing form
could I be refreshing? could you be refreshing? could she be refreshing? could we be refreshing? could you be refreshing? could they be refreshing?
Perfect
could I have refreshed? could you have refreshed? could she 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 she 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 she 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 she 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 she 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 she have been refreshing? couldn't we have been refreshing? couldn't you have been refreshing? couldn't they have been refreshing?