継父
My stepfather assembles it.
継父が組み立てます
My stepfather assembles a desk.
継父が机を組み立てます
My stepfather assembles a desk in the child's room.
継父が子供部屋で机を組み立てます
My stepfather assembles a desk in the child's room on Saturday.
継父が土曜日に子供部屋で机を組み立てます
My stepfather assembles a desk in the child's room with his son on Saturday.
継父が息子と土曜日に子供部屋で机を組み立てます