4 sentences

1. 我有个孪生姐姐。

   wǒ yǒu ge luán​shēng jiě​jie.

   I have a twin sister.

   Source: OpenSubtitles

2. 你有没有孪生姐妹？

   nǐ yǒu​méi​yǒu luán​shēng​jiě​mèi?

   Do you have a twin sister?

   Source: OpenSubtitles

3. 她一定有个孪生姐妹什么的。

   tā yī​dìng yǒu ge luán​shēng​jiě​mèi shén​me​de.

   She must have a twin sister or something.

   Source: AI Challenger 2017

4. 你还有个孪生兄弟吗？

   nǐ hái​yǒu ge luán​shēng​xiōng​dì ma?

   Do you have a twin brother?

   Source: OpenSubtitles