Using 跟(gēn) to express "with" is so simple, it will always be with you in Chinese grammar!

Structure:
The preposition "跟" (gēn) is commonly used to express "with".

Examples:

Tā ɡēn tā jiārén yìqǐ chīfàn.
他 跟 他 家人 一起 吃饭。
I eat with your family members.

Nǐ yào ɡēn wǒ yìqǐ qù mɑ?
你 要 跟 我 一起 去 吗？
Do you want to go with me?