3 sentences

1. 他是我相处了二十年的挚友。

   tā shì wǒ xiāng​chǔ le èr​shí nián de zhì​yǒu.

   He has been my close friend for twenty years.

   Source: Dong Chinese Dictionary

2. 她始终无法从失去挚友的伤痛中走出来。

   tā shǐ​zhōng wú​fǎ cóng shī​qù zhì​yǒu de shāng​tòng zhōng zǒu chu​lai.

   She has never been able to get over the grief of losing her best friend.

   Source: Dong Chinese Dictionary

3. 这位小说主角的原型是作者在现实生活中的一位挚友。

   zhè wèi xiǎo​shuō zhǔ​jué de yuán​xíng shì zuò​zhě zài xiàn​shí shēng​huó zhōng de yī wèi zhì​yǒu.

   The protagonist of this novel is based on a close friend of the author in real life.

   Source: Dong Chinese Dictionary