Lǎo shī zài hēi bǎn shàng bǎ zì xiě dé hěn dà，yǐ biàn hòu pái de tóng xué yě néng kàn qīng chǔ。
The teacher wrote the characters very large on the blackboard so that pupils on the back row could also see them clearly.
 Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.