Where does 一起 go when you're doing something with someone?
一起 sits right before the verb; the person you're with comes first.
English 'together' floats anywhere: 'together we study', 'we study together'. Chinese pins 一起 to one slot, glued to the front of the verb. The person you're doing it with can't stand next to 一起. They need 和 or 跟 in front, and that whole chunk sits before 一起. Drop 和/跟 and you get 我一起他学习, which lands on native ears as broken. 一起 is glue for the action, not a word that can grab a person. So the order is: subject, then 和/跟 + person, then 一起, then the verb. “高友朋的英语不好,我想我可以和他一起学习。” ── [《友好的高友朋》](/read/friendly-beijing-coworker#s11)
| Situation / Pattern | Formula | Natural | Avoid |
|---|---|---|---|
| Doing it with one person | Subject + 和/跟 + Person + 一起 + Verb | 我明天想跟他一起去看电影。 | 我明天想一起跟他去看电影。 |
| Suggesting a group action | 咱们/我们 + 一起 + Verb + 吧 | 咱们一起走吧。 | 咱们走吧一起。 |
| Forgetting the companion word | Subject + 跟 + Person + 一起 + Verb | 我跟同事一起点外卖。 | 我一起同事点外卖。 |