They brought (prosepheron). Imperfect, “were bringing,” graphic picture made very vivid by the details in Mar 2:1-4 and Luk 5:17.
“Lying on a bed” (stretched on a couch), perfect passive participle, a little bed or couch (klinidion) in Luk 5:19, “a pallet” (krabatos) in Mar 2:4, Mar 2:9,Mar 2:11.
Thy sins are forgiven (aphientai). Present passive indicative (aoristic present). Luke (Luk 5:21) has apheōntai, Doric and Ionic perfect passive indicative for the Attic apheintai, one of the dialectical forms appearing in the Koiné.