I could readvertise you could readvertise she could readvertise we could readvertise you could readvertise they could readvertise
V-ing form
I could be readvertising you could be readvertising she could be readvertising we could be readvertising you could be readvertising they could be readvertising
Perfect
I could have readvertised you could have readvertised she could have readvertised we could have readvertised you could have readvertised they could have readvertised
V-ing perfect
I could have been readvertising you could have been readvertising she could have been readvertising we could have been readvertising you could have been readvertising they could have been readvertising
Negation
Simple form
I couldn't readvertise you couldn't readvertise she couldn't readvertise we couldn't readvertise you couldn't readvertise they couldn't readvertise
V-ing form
I couldn't be readvertising you couldn't be readvertising she couldn't be readvertising we couldn't be readvertising you couldn't be readvertising they couldn't be readvertising
Perfect
I couldn't have readvertised you couldn't have readvertised she couldn't have readvertised we couldn't have readvertised you couldn't have readvertised they couldn't have readvertised
V-ing perfect
I couldn't have been readvertising you couldn't have been readvertising she couldn't have been readvertising we couldn't have been readvertising you couldn't have been readvertising they couldn't have been readvertising
Interrogative form
Simple form
could I readvertise? could you readvertise? could she readvertise? could we readvertise? could you readvertise? could they readvertise?
V-ing form
could I be readvertising? could you be readvertising? could she be readvertising? could we be readvertising? could you be readvertising? could they be readvertising?
Perfect
could I have readvertised? could you have readvertised? could she have readvertised? could we have readvertised? could you have readvertised? could they have readvertised?
V-ing perfect
could I have been readvertising? could you have been readvertising? could she have been readvertising? could we have been readvertising? could you have been readvertising? could they have been readvertising?
Interro-negative form
Simple form
couldn't I readvertise? couldn't you readvertise? couldn't she readvertise? couldn't we readvertise? couldn't you readvertise? couldn't they readvertise?
V-ing form
couldn't I be readvertising? couldn't you be readvertising? couldn't she be readvertising? couldn't we be readvertising? couldn't you be readvertising? couldn't they be readvertising?
Perfect
couldn't I have readvertised? couldn't you have readvertised? couldn't she have readvertised? couldn't we have readvertised? couldn't you have readvertised? couldn't they have readvertised?
V-ing perfect
couldn't I have been readvertising? couldn't you have been readvertising? couldn't she have been readvertising? couldn't we have been readvertising? couldn't you have been readvertising? couldn't they have been readvertising?