5 sentences

1. 这是我家的备用钥匙。

   zhè shì wǒ jiā de bèi​yòng yào​shi.

   Here's a spare key to my house.

   Source: OpenSubtitles

2. 只有一把备用钥匙。

   zhǐ yǒu yī bǎ bèi​yòng yào​shi.

   There's only one spare key.

   Source: OpenSubtitles

3. 你有备用钥匙吗？

   nǐ yǒu bèi​yòng yào​shi ma?

   Do you have a spare key?

   Source: OpenSubtitles

4. 他总是随身带一把备用钥匙。

   tā zǒng​shì suí​shēn dài yī bǎ bèi​yòng yào​shi.

   He always carries a spare key with him.

   Source: Dong Chinese Dictionary

5. 幸好我身边带着备用钥匙，否则就进不去家门了。

   xìng​hǎo wǒ shēn​biān dài zhe bèi​yòng yào​shi, fǒu​zé jiù jìn bù qù jiā​mén le.

   Luckily I had a spare key on me, otherwise I wouldn't have been able to get into the house.

   Source: Dong Chinese Dictionary