You can use these cards in any agreement / disagreement activity from a book or a photocopy of your choice. Select those expressions you want, print them out in red, green, yellow and blue sheets of paper. Those expressions which mean strong disagreement should be printed on a red sheet; the ones which mean strong agreement, on a green sheet; the ones which imply a mild agreement or disagreement, on a yellow one; and those expressions which are neutral, on a blue sheet.
Make students face a dilemma, a question, a problem, the need of a choice, etc. Spread the cards on the table in front of them. The colours may help students recognise the type of expression they need in every occasion, but it’s not compulsory.