Sing somebody's / someone's praises
Sing somebody's / someone's praises = нахваливать, петь дифирамбы (to praise someone or something very much).
1) You've obviously made a good impression on Paul - he was singing your praises last night.
2) Mat seems happy enough in Brighton - he's always singing its praises.
3) I hate the city, but my sister is always singing its praises.