5 sentences

1. 我有个天大的好消息。

   wǒ yǒu gè tiān​dà de hǎo xiāo​xi.

   I've got some great news.

   Source: OpenSubtitles

2. 是我犯了天大的失误。

   shì wǒ fàn le tiān​dà de shī​wù.

   I've made a huge mistake.

   Source: OpenSubtitles

3. 他说他有个天大的秘密。

   tā shuō tā yǒu gè tiān​dà de mì​mì.

   He said he has a huge secret.

   Source: OpenSubtitles

4. 我们低估他，真是犯了天大的错误。

   wǒ​men dī​gū tā, zhēn shì fàn le tiān​dà de cuò​wù.

   We've made a grave mistake underestimating him.

   Source: OpenSubtitles

5. 就算有天大的困难，我们也要克服。

   jiù​suàn yǒu tiān​dà de kùn​nan, wǒ​men yě yào kè​fú.

   Even if there are enormous difficulties, we must overcome them.

   Source: Dong Chinese Dictionary