I can pay you can pay he can pay we can pay you can pay they can pay
V-ing form
I can be paying you can be paying he can be paying we can be paying you can be paying they can be paying
Perfect
I can have paid you can have paid he 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 he can have been paying we can have been paying you can have been paying they can have been paying
Negation
Simple form
I cannot pay you cannot pay he cannot pay we cannot pay you cannot pay they cannot pay
V-ing form
I cannot be paying you cannot be paying he cannot be paying we cannot be paying you cannot be paying they cannot be paying
Perfect
I cannot have paid you cannot have paid he cannot have paid we cannot have paid you cannot have paid they cannot have paid
V-ing perfect
I cannot have been paying you cannot have been paying he cannot have been paying we cannot have been paying you cannot have been paying they cannot have been paying
Interrogative form
Simple form
can I pay? can you pay? can he pay? can we pay? can you pay? can they pay?
V-ing form
can I be paying? can you be paying? can he be paying? can we be paying? can you be paying? can they be paying?
Perfect
can I have paid? can you have paid? can he 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 he have been paying? can we have been paying? can you have been paying? can they have been paying?
Interro-negative form
Simple form
can I not pay? can you not pay? can he not pay? can we not pay? can you not pay? can they not pay?
V-ing form
can I not be paying? can you not be paying? can he not be paying? can we not be paying? can you not be paying? can they not be paying?
Perfect
can I not have paid? can you not have paid? can he not have paid? can we not have paid? can you not have paid? can they not have paid?
V-ing perfect
can I not have been paying? can you not have been paying? can he not have been paying? can we not have been paying? can you not have been paying? can they not have been paying?