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