与/和 + Person + 一同 + Verb
The adverb 一同 (yītóng) means "together" and is a more formal alternative to 一起. It is placed before the verb to indicate that an action is done jointly. For example, 一同参加舞会 means "to attend the dance together."
我们一同去参加他的毕业典礼吧。
wǒmen yìtóng qù cānjiā tā de bìyè diǎnlǐ ba.
Let's go together to attend his graduation ceremony.
三位同事一同前往上海出差。
sān wèi tóngshì yìtóng qiánwǎng Shànghǎi chūchāi.
Three colleagues went to Shanghai together on a business trip.
老师和学生们一同完成了这个项目。
lǎoshī hé xuéshēngmen yìtóng wánchéng le zhè ge xiàngmù.
The teacher and students completed this project together.