3 sentences for 好使 (hǎo​shǐ — effective)

1. 我眼睛没以前好使了。

   wǒ yǎn​jing méi yǐ​qián hǎo​shǐ le.

   My eyes aren't what they used to be.

   Source: OpenSubtitles

2. 这把剪刀不好使。

   zhè bǎ jiǎn​dāo bù hǎo​shǐ.

   These scissors don't cut well.

   Source: Tatoeba

3. 这把剪刀真好使。

   zhè bǎ jiǎn​dāo zhēn hǎo​shǐ.

   This pair of scissors is really easy to use.

   Source: Dong Chinese Dictionary