S1A1D2
4 points
SAD is validvalid
unhappy [adj SADDER, SADDEST] : SADLY [adv], SADNESS [n]
unhappy [adj SADDER, SADDEST, SADLY] / to express sadness [v SADDED, SADDING, SADS]
unhappy [adj SADDER, SADDEST] : SADLY [adv], SADNESS [n]
unhappy [adj SADDER, SADDEST, SADLY] / to express sadness [v SADDED, SADDING, SADS]