是at my work还是 on my work?

是at my work还是 on my work? Work hard at my study还是on my study? at my free time 还是on my free time 在我的生日会上是用 on my birthday party 还是 at my birthday party 是work hard at sth.还是work hard on sth. 英语 是do my job 还是do my work?谢谢 I was （at） my uncles 是用at in还是on啊 get on well with my lessons 还是 work on well with my lessons I have to work hard at my lessons from now on.翻译下```at my lessons什么意思 now on work on my 如题, work on may letter和work at my letter都可以吗,有什么区别 my brother goes to work on weekdays的同义句my brother （）（）to work at weekends i must be at work at 10 o'clock.My employer will confirm that I was there on time如题,他这里的must be是连用的吗?表示猜测 还是说be只是单纯做谓语而已 我的手机剩下2%英语是说my phone is on 2% 还是 my phone is at 2% my classrom is ?the first floor 答案是on还是at 英文 finish work对吗?finish my work是还是finish my job? 是on my birthday还是in my birthday 是 in my opinion 还是 on my opinion