Holidays game - spontaneous speaking

Edit - mistakes corrected! In groups of 2-4, pupils divide cards equally between them face down in front of them. Each pupil takes turns to take top card from their pile & reads the sentence out loud, then puts it face down in the middle. If they get a card that just says 'Tricheur!', they have to make up a sentence of their own on the same topic. If their opponents can tell they're making up the sentence on the spot, they can accuse the pupil of cheating - if they are, the pupil has to pick up all the cards from the middle. If not, the person who accused them picks up the cards.