必(かなら)ず() kanarazuこの konoハガキ hagakiを o投(とう)函(かん) toukanし shiなさい nasai。 Make sure to mail this postcard. Literal Certainly this postcard [object-を] posting [command-なさい]. 投函しなさい — 投函する means 'to mail, to post (in a mailbox).' A simple command with 必ず for emphasis. ハガキ is 'postcard.' commandsmail and post~なさい (polite imperative)
必(かなら)ず() kanarazuこの konoハガキ hagakiを o投(とう)函(かん) toukanし shiなさい nasai。 Make sure to mail this postcard. Literal Certainly this postcard [object-を] posting [command-なさい]. 投函しなさい — 投函する means 'to mail, to post (in a mailbox).' A simple command with 必ず for emphasis. ハガキ is 'postcard.' commandsmail and post~なさい (polite imperative)