Rule reminder

When a perception verb in the passato composto takes a direct object clitic (lo, la, li, le), the past participle agrees with the clitic in gender and number: L'ho vista piangere (fem. sing.), Li ho sentiti ridere (masc. pl.), Le ho viste arrivare (fem. pl.). With 'ne', the participle agrees in number: Ne ho sentiti parlare (masc. pl.).