2 sentences

1. 我得先知道自己是谁。

   wǒ děi xiān zhī​dao zì​jǐ shì shéi.

   I have to know who I am first.

   Source: OpenSubtitles

2. 你得先知道你的尺寸。

   nǐ děi xiān zhī​dao nǐ de chǐ​cun.

   First, you must know your size.

   Source: CCMatrix