lǎoshī / ràng / xuéshēng / bǎ / kèběn / fān / dào / dìshíyè / zhè / jiùshì / yīgè / qíshǐjù老师让学生把课本翻到第十页,这就是一个祈使句。The teacher told the students to turn the textbook to page ten—this is an imperative sentence.