English verb conjugation
COULD ADVERTISE

Regular verb: advertise - advertised - advertised

Affirmation

Simple form	V-ing form
I could advertise you could advertise she could advertise we could advertise you could advertise they could advertise	I could be advertising you could be advertising she could be advertising we could be advertising you could be advertising they could be advertising
Perfect	V-ing perfect
I could have advertised you could have advertised she could have advertised we could have advertised you could have advertised they could have advertised	I could have been advertising you could have been advertising she could have been advertising we could have been advertising you could have been advertising they could have been advertising

Negation

Simple form	V-ing form
I couldn't advertise you couldn't advertise she couldn't advertise we couldn't advertise you couldn't advertise they couldn't advertise	I couldn't be advertising you couldn't be advertising she couldn't be advertising we couldn't be advertising you couldn't be advertising they couldn't be advertising
Perfect	V-ing perfect
I couldn't have advertised you couldn't have advertised she couldn't have advertised we couldn't have advertised you couldn't have advertised they couldn't have advertised	I couldn't have been advertising you couldn't have been advertising she couldn't have been advertising we couldn't have been advertising you couldn't have been advertising they couldn't have been advertising

Interrogative form

Simple form	V-ing form
could I advertise? could you advertise? could she advertise? could we advertise? could you advertise? could they advertise?	could I be advertising? could you be advertising? could she be advertising? could we be advertising? could you be advertising? could they be advertising?
Perfect	V-ing perfect
could I have advertised? could you have advertised? could she have advertised? could we have advertised? could you have advertised? could they have advertised?	could I have been advertising? could you have been advertising? could she have been advertising? could we have been advertising? could you have been advertising? could they have been advertising?

Interro-negative form

Simple form	V-ing form
couldn't I advertise? couldn't you advertise? couldn't she advertise? couldn't we advertise? couldn't you advertise? couldn't they advertise?	couldn't I be advertising? couldn't you be advertising? couldn't she be advertising? couldn't we be advertising? couldn't you be advertising? couldn't they be advertising?
Perfect	V-ing perfect
couldn't I have advertised? couldn't you have advertised? couldn't she have advertised? couldn't we have advertised? couldn't you have advertised? couldn't they have advertised?	couldn't I have been advertising? couldn't you have been advertising? couldn't she have been advertising? couldn't we have been advertising? couldn't you have been advertising? couldn't they have been advertising?