4 sentences

1. 他在用打字机写信。

   tā zài yòng dǎ​zì​jī xiě​xìn.

   He is using a typewriter to write a letter.

   Source: Dong Chinese Dictionary

2. 我喜欢我的打字机。

   wǒ xǐ​huan wǒ de dǎ​zì​jī.

   I like my typewriter.

   Source: OpenSubtitles

3. ‎你知道打字机吗？

   ‎ nǐ zhī​dào dǎ​zì​jī ma?

   Do you know about typewriters?

   Source: OpenSubtitles

4. 这台旧打字机是怎么回事？

   zhè tái jiù dǎ​zì​jī shì zěn​me huí​shì?

   What's with the old typewriter?

   Source: OpenSubtitles