I can pay you can pay she can pay we can pay you can pay they can pay
V-ing form
I can be paying you can be paying she can be paying we can be paying you can be paying they can be paying
Perfect
I can have paid you can have paid she can have paid we can have paid you can have paid they can have paid
V-ing perfect
I can have been paying you can have been paying she can have been paying we can have been paying you can have been paying they can have been paying
Negation
Simple form
I can't pay you can't pay she can't pay we can't pay you can't pay they can't pay
V-ing form
I can't be paying you can't be paying she can't be paying we can't be paying you can't be paying they can't be paying
Perfect
I can't have paid you can't have paid she can't have paid we can't have paid you can't have paid they can't have paid
V-ing perfect
I can't have been paying you can't have been paying she can't have been paying we can't have been paying you can't have been paying they can't have been paying
Interrogative form
Simple form
can I pay? can you pay? can she pay? can we pay? can you pay? can they pay?
V-ing form
can I be paying? can you be paying? can she be paying? can we be paying? can you be paying? can they be paying?
Perfect
can I have paid? can you have paid? can she have paid? can we have paid? can you have paid? can they have paid?
V-ing perfect
can I have been paying? can you have been paying? can she have been paying? can we have been paying? can you have been paying? can they have been paying?
Interro-negative form
Simple form
can't I pay? can't you pay? can't she pay? can't we pay? can't you pay? can't they pay?
V-ing form
can't I be paying? can't you be paying? can't she be paying? can't we be paying? can't you be paying? can't they be paying?
Perfect
can't I have paid? can't you have paid? can't she have paid? can't we have paid? can't you have paid? can't they have paid?
V-ing perfect
can't I have been paying? can't you have been paying? can't she have been paying? can't we have been paying? can't you have been paying? can't they have been paying?