I could readvertise you could readvertise he could readvertise we could readvertise you could readvertise they could readvertise
V-ing form
I could be readvertising you could be readvertising he could be readvertising we could be readvertising you could be readvertising they could be readvertising
Perfect
I could have readvertised you could have readvertised he 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 he 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 he 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 he 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 he 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 he 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 he readvertise? could we readvertise? could you readvertise? could they readvertise?
V-ing form
could I be readvertising? could you be readvertising? could he be readvertising? could we be readvertising? could you be readvertising? could they be readvertising?
Perfect
could I have readvertised? could you have readvertised? could he 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 he 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 he 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 he 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 he 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 he have been readvertising? couldn't we have been readvertising? couldn't you have been readvertising? couldn't they have been readvertising?