2 sentences

1. 这个顽皮的男孩不得不重读五年级。

   zhè​ge wán​pí de nán​hái bù​dé​bù chóng​dú wǔ nián​jí.

   The naughty boy had to repeat the fifth grade.

   Source: UM-Corpus: News

2. 她不知道怎样管好自己的顽皮孩子。

   tā bù​zhī​dào zěn​yàng guǎn hǎo zì​jǐ de wán​pí hái​zi.

   She doesn't know how to manage her naughty children.

   Source: UM-Corpus: Spoken