1-lenga‘The washing is hanging on the line’ — Izingubo eziwashiwe zilenga kulayini
2-lengisa‘They used to hang people for crimes such as murder’ — Babejwayele ukulengisa abantu abenze amacala afana nokubulala
In sense 1 hung should be used as past tense and past participle, but in sense 2 hanged is the correct form. For example: The washing hung on the line. In the old days he would have been hanged for murder.