3 sentences

1. 这个词的用法很复杂。

   zhè gè cí de yòng​fǎ hěn fù​zá.

   The usage of this word is very complex.

   Source: Dong Chinese Dictionary

2. 老师在课堂上强调了数词和量的搭配用法。

   lǎo​shī zài kè​táng shàng qiáng​diào le shù​cí hé liàng de dā​pèi yòng​fǎ.

   The teacher emphasized the usage and collocation of numerals and measure words in class.

   Source: Dong Chinese Dictionary

3. 在古代汉语课上，老师讲解了德字在反切中的用法。

   zài gǔ​dài Hàn​yǔ kè shàng, lǎo​shī jiǎng​jiě le dé zì zài fǎn qiè zhōng de yòng​fǎ.

   In the Ancient Chinese class, the teacher explained the use of the character '德' in fanqie.

   Source: Dong Chinese Dictionary