2 sentences for 焉 (yān — how)

1. 古人云：三人行，必有我师焉。

   gǔ​rén yún: sān rén xíng, bì yǒu wǒ shī yān.

   The ancients said: 'In a group of three, there is always someone I can learn from.'

   Source: Dong Chinese Dictionary

2. 如果不亲身实践，焉能取得成功？

   rú​guǒ bù qīn​shēn shí​jiàn, yān néng qǔ​dé chéng​gōng?

   How can one achieve success without personal practice?

   Source: Dong Chinese Dictionary