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