English verb conjugation
COULD PREADVERTISE

Regular verb: preadvertise - preadvertised - preadvertised

Affirmation

Simple form	V-ing form
I could preadvertise you could preadvertise he could preadvertise we could preadvertise you could preadvertise they could preadvertise	I could be preadvertising you could be preadvertising he could be preadvertising we could be preadvertising you could be preadvertising they could be preadvertising
Perfect	V-ing perfect
I could have preadvertised you could have preadvertised he could have preadvertised we could have preadvertised you could have preadvertised they could have preadvertised	I could have been preadvertising you could have been preadvertising he could have been preadvertising we could have been preadvertising you could have been preadvertising they could have been preadvertising

Negation

Simple form	V-ing form
I couldn't preadvertise you couldn't preadvertise he couldn't preadvertise we couldn't preadvertise you couldn't preadvertise they couldn't preadvertise	I couldn't be preadvertising you couldn't be preadvertising he couldn't be preadvertising we couldn't be preadvertising you couldn't be preadvertising they couldn't be preadvertising
Perfect	V-ing perfect
I couldn't have preadvertised you couldn't have preadvertised he couldn't have preadvertised we couldn't have preadvertised you couldn't have preadvertised they couldn't have preadvertised	I couldn't have been preadvertising you couldn't have been preadvertising he couldn't have been preadvertising we couldn't have been preadvertising you couldn't have been preadvertising they couldn't have been preadvertising

Interrogative form

Simple form	V-ing form
could I preadvertise? could you preadvertise? could he preadvertise? could we preadvertise? could you preadvertise? could they preadvertise?	could I be preadvertising? could you be preadvertising? could he be preadvertising? could we be preadvertising? could you be preadvertising? could they be preadvertising?
Perfect	V-ing perfect
could I have preadvertised? could you have preadvertised? could he have preadvertised? could we have preadvertised? could you have preadvertised? could they have preadvertised?	could I have been preadvertising? could you have been preadvertising? could he have been preadvertising? could we have been preadvertising? could you have been preadvertising? could they have been preadvertising?

Interro-negative form

Simple form	V-ing form
couldn't I preadvertise? couldn't you preadvertise? couldn't he preadvertise? couldn't we preadvertise? couldn't you preadvertise? couldn't they preadvertise?	couldn't I be preadvertising? couldn't you be preadvertising? couldn't he be preadvertising? couldn't we be preadvertising? couldn't you be preadvertising? couldn't they be preadvertising?
Perfect	V-ing perfect
couldn't I have preadvertised? couldn't you have preadvertised? couldn't he have preadvertised? couldn't we have preadvertised? couldn't you have preadvertised? couldn't they have preadvertised?	couldn't I have been preadvertising? couldn't you have been preadvertising? couldn't he have been preadvertising? couldn't we have been preadvertising? couldn't you have been preadvertising? couldn't they have been preadvertising?