Emphasizing the doer of an action with "you"

由 (yóu) is used to emphasize who is the doer or initiator of an action, a bit like in English where we might say: "Andy is the one who...."

Structure

Topic + 由 + Person + Verb

这件事由我负责。Zhè jiàn shìyóu wǒ fùzé.I am responsible for this.
这件事是由她引起的。Zhè jiàn shì shì yóu tā yǐnqǐ de.The incident was caused by her.
这次的广告是由他一个人拍摄的。Zhè cì de guǎnggào shì yóu tā yīgèrén pāishè de.The advertisement was shot by him alone.
你想怎么样生活，完全由你自己规划。Nǐ xiǎng zěnmeyàng shēnghuó, wánquán yóu nǐ zìjǐ guīhuà.How you want to live your life is entirely up to you.
你去过上海，那这次就由你做导游。Nǐ qùguò Shànghǎi, nà zhè cì jiù yóu nǐ zuò dǎoyóu.You have been to Shanghai before, so you will be the tour guide this time.
这个国家的粮食主要由加拿大进口。Zhè gè guójiā de liángshi zhǔyào yóu Jiānádà jìnkǒu.Canada is the main importer of food in this country.
这件事由我说了算。Zhè jiàn shì yóu wǒ shuō le suàn.This is a matter for me to decide.
这个规定是由政府发布的。Zhège guīdìng shì yóu zhèngfǔ fābù de.This is a regulation issued by the government.
这是由他决定的，你就别干涉了。Zhè shì yóu tā juédìng de, nǐ jiù bié gānshèle.This is for him to decide, don't meddle.
太悲剧了，会议由王总主持，肯定会很无聊！Tài bēijùle, huìyì yóu wáng zǒng zhǔchí, kěndìng huì hěn wúliáo!Oh no. This meeting is being led by the head manager. It's definitely going to be boring.

Note that 由 not a passive marker.