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