English verb conjugation
COULD CONCERTISE

Regular verb: concertise - concertised - concertised

Affirmation

Simple form	V-ing form
I could concertise you could concertise she could concertise we could concertise you could concertise they could concertise	I could be concertising you could be concertising she could be concertising we could be concertising you could be concertising they could be concertising
Perfect	V-ing perfect
I could have concertised you could have concertised she could have concertised we could have concertised you could have concertised they could have concertised	I could have been concertising you could have been concertising she could have been concertising we could have been concertising you could have been concertising they could have been concertising

Negation

Simple form	V-ing form
I couldn't concertise you couldn't concertise she couldn't concertise we couldn't concertise you couldn't concertise they couldn't concertise	I couldn't be concertising you couldn't be concertising she couldn't be concertising we couldn't be concertising you couldn't be concertising they couldn't be concertising
Perfect	V-ing perfect
I couldn't have concertised you couldn't have concertised she couldn't have concertised we couldn't have concertised you couldn't have concertised they couldn't have concertised	I couldn't have been concertising you couldn't have been concertising she couldn't have been concertising we couldn't have been concertising you couldn't have been concertising they couldn't have been concertising

Interrogative form

Simple form	V-ing form
could I concertise? could you concertise? could she concertise? could we concertise? could you concertise? could they concertise?	could I be concertising? could you be concertising? could she be concertising? could we be concertising? could you be concertising? could they be concertising?
Perfect	V-ing perfect
could I have concertised? could you have concertised? could she have concertised? could we have concertised? could you have concertised? could they have concertised?	could I have been concertising? could you have been concertising? could she have been concertising? could we have been concertising? could you have been concertising? could they have been concertising?

Interro-negative form

Simple form	V-ing form
couldn't I concertise? couldn't you concertise? couldn't she concertise? couldn't we concertise? couldn't you concertise? couldn't they concertise?	couldn't I be concertising? couldn't you be concertising? couldn't she be concertising? couldn't we be concertising? couldn't you be concertising? couldn't they be concertising?
Perfect	V-ing perfect
couldn't I have concertised? couldn't you have concertised? couldn't she have concertised? couldn't we have concertised? couldn't you have concertised? couldn't they have concertised?	couldn't I have been concertising? couldn't you have been concertising? couldn't she have been concertising? couldn't we have been concertising? couldn't you have been concertising? couldn't they have been concertising?