4 sentences

1. 谁在为他担保？

   shéi zài wèi tā dān​bǎo?

   Who's vouching for him?

   Source: OpenSubtitles

2. 申请贷款时，他找了朋友来做担保。

   shēn​qǐng dài​kuǎn shí, tā zhǎo le péng​you lái zuò dān​bǎo.

   When applying for a loan, he found a friend to act as a guarantor.

   Source: Dong Chinese Dictionary

3. 他把房产证押在银行作为贷款担保。

   tā bǎ fáng​chǎn​zhèng yā zài yín​háng zuò​wéi dài​kuǎn dān​bǎo.

   He pledged his property deed to the bank as security for the loan.

   Source: Dong Chinese Dictionary

4. 我可以用我的名誉担保，他说的话全是真的。

   wǒ kě​yǐ yòng wǒ de míng​yù dān​bǎo, tā shuō de huà quán shì zhēn de.

   I can guarantee on my reputation that everything he says is true.

   Source: Dong Chinese Dictionary