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Okay, I'm not sure if they are "rules" or "grammatical", but here they go: After a while our necks began to ache, so we sat on the rest chairs behind (us). I liked it here. The air was fresh ...
#3: Attribution notice added
Source: https://writers.stackexchange.com/q/17012 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Okay, I'm not sure if they are "rules" or "grammatical", but here they go: > After a while our necks began to ache, so we sat on the rest chairs behind **(us)**. I liked it here. The air was fresh and there was a low hip roof to shelter us from the wind. > > To give myself something to do, I searched for constellations. I wasn't an expert **(on it)**; my knowledge was limited to horoscope columns and astronomy documentaries. As an author, would you omit the **bolded** parts? Why or why not?