I could fit you could fit he could fit we could fit you could fit they could fit
V-ing form
I could be fitting you could be fitting he could be fitting we could be fitting you could be fitting they could be fitting
Perfect
I could have fit, fitted you could have fit, fitted he could have fit, fitted we could have fit, fitted you could have fit, fitted they could have fit, fitted
V-ing perfect
I could have been fitting you could have been fitting he could have been fitting we could have been fitting you could have been fitting they could have been fitting
Negation
Simple form
I could not fit you could not fit he could not fit we could not fit you could not fit they could not fit
V-ing form
I could not be fitting you could not be fitting he could not be fitting we could not be fitting you could not be fitting they could not be fitting
Perfect
I could not have fit, fitted you could not have fit, fitted he could not have fit, fitted we could not have fit, fitted you could not have fit, fitted they could not have fit, fitted
V-ing perfect
I could not have been fitting you could not have been fitting he could not have been fitting we could not have been fitting you could not have been fitting they could not have been fitting
Interrogative form
Simple form
could I fit? could you fit? could he fit? could we fit? could you fit? could they fit?
V-ing form
could I be fitting? could you be fitting? could he be fitting? could we be fitting? could you be fitting? could they be fitting?
Perfect
could I have fit, fitted? could you have fit, fitted? could he have fit, fitted? could we have fit, fitted? could you have fit, fitted? could they have fit, fitted?
V-ing perfect
could I have been fitting? could you have been fitting? could he have been fitting? could we have been fitting? could you have been fitting? could they have been fitting?
Interro-negative form
Simple form
could I not fit? could you not fit? could he not fit? could we not fit? could you not fit? could they not fit?
V-ing form
could I not be fitting? could you not be fitting? could he not be fitting? could we not be fitting? could you not be fitting? could they not be fitting?
Perfect
could I not have fit, fitted? could you not have fit, fitted? could he not have fit, fitted? could we not have fit, fitted? could you not have fit, fitted? could they not have fit, fitted?
V-ing perfect
could I not have been fitting? could you not have been fitting? could he not have been fitting? could we not have been fitting? could you not have been fitting? could they not have been fitting?