Jùzi shì yóu cí huò cízǔ ànzhào yīdìng de yǔfǎ liánxì de, gòuchéng jùzi de cí huò cízǔ zài jù zhōng dānrèn de yǔfǎ zhíwù hé suǒ qǐ de zuòyòng jiù jiào jùzi chéngfèn.
Sentences are composed of words and phrases arranged according to certain grammatical relations. Since these words and phrases perform certain functions these are called sentence elements.