I can advertise you can advertise he can advertise we can advertise you can advertise they can advertise
V-ing form
I can be advertising you can be advertising he can be advertising we can be advertising you can be advertising they can be advertising
Perfect
I can have advertised you can have advertised he can have advertised we can have advertised you can have advertised they can have advertised
V-ing perfect
I can have been advertising you can have been advertising he can have been advertising we can have been advertising you can have been advertising they can have been advertising
Negation
Simple form
I cannot advertise you cannot advertise he cannot advertise we cannot advertise you cannot advertise they cannot advertise
V-ing form
I cannot be advertising you cannot be advertising he cannot be advertising we cannot be advertising you cannot be advertising they cannot be advertising
Perfect
I cannot have advertised you cannot have advertised he cannot have advertised we cannot have advertised you cannot have advertised they cannot have advertised
V-ing perfect
I cannot have been advertising you cannot have been advertising he cannot have been advertising we cannot have been advertising you cannot have been advertising they cannot have been advertising
Interrogative form
Simple form
can I advertise? can you advertise? can he advertise? can we advertise? can you advertise? can they advertise?
V-ing form
can I be advertising? can you be advertising? can he be advertising? can we be advertising? can you be advertising? can they be advertising?
Perfect
can I have advertised? can you have advertised? can he have advertised? can we have advertised? can you have advertised? can they have advertised?
V-ing perfect
can I have been advertising? can you have been advertising? can he have been advertising? can we have been advertising? can you have been advertising? can they have been advertising?
Interro-negative form
Simple form
can I not advertise? can you not advertise? can he not advertise? can we not advertise? can you not advertise? can they not advertise?
V-ing form
can I not be advertising? can you not be advertising? can he not be advertising? can we not be advertising? can you not be advertising? can they not be advertising?
Perfect
can I not have advertised? can you not have advertised? can he not have advertised? can we not have advertised? can you not have advertised? can they not have advertised?
V-ing perfect
can I not have been advertising? can you not have been advertising? can he not have been advertising? can we not have been advertising? can you not have been advertising? can they not have been advertising?