I can work you can work she can work we can work you can work they can work
V-ing form
I can be working you can be working she can be working we can be working you can be working they can be working
Perfect
I can have worked you can have worked she can have worked we can have worked you can have worked they can have worked
V-ing perfect
I can have been working you can have been working she can have been working we can have been working you can have been working they can have been working
Negation
Simple form
I can't work you can't work she can't work we can't work you can't work they can't work
V-ing form
I can't be working you can't be working she can't be working we can't be working you can't be working they can't be working
Perfect
I can't have worked you can't have worked she can't have worked we can't have worked you can't have worked they can't have worked
V-ing perfect
I can't have been working you can't have been working she can't have been working we can't have been working you can't have been working they can't have been working
Interrogative form
Simple form
can I work? can you work? can she work? can we work? can you work? can they work?
V-ing form
can I be working? can you be working? can she be working? can we be working? can you be working? can they be working?
Perfect
can I have worked? can you have worked? can she have worked? can we have worked? can you have worked? can they have worked?
V-ing perfect
can I have been working? can you have been working? can she have been working? can we have been working? can you have been working? can they have been working?
Interro-negative form
Simple form
can't I work? can't you work? can't she work? can't we work? can't you work? can't they work?
V-ing form
can't I be working? can't you be working? can't she be working? can't we be working? can't you be working? can't they be working?
Perfect
can't I have worked? can't you have worked? can't she have worked? can't we have worked? can't you have worked? can't they have worked?
V-ing perfect
can't I have been working? can't you have been working? can't she have been working? can't we have been working? can't you have been working? can't they have been working?