3 sentences

1. 我们并非一切从头开始。

   wǒ​men bìng​fēi yī​qiè cóng​tóu​kāi​shǐ.

   We are not starting from scratch.

   Source: United Nations

2. 我们从头开始吧。

   wǒ​men cóng​tóu​kāi​shǐ ba.

   Let's start from the beginning.

   Source: OpenSubtitles

3. 我会从头开始说。

   wǒ huì cóng​tóu​kāi​shǐ shuō.

   I'll start at the beginning.

   Source: OpenSubtitles