为什么要用on your left?不用with或at?

为什么要用on your left?不用with或at? on your arrival 为什么用on 不用 at i have left my book in your room中的left怎么理解?这句话译成我把书忘记在你的房间里了,这里为什么要用left?不是离开的意思吗?为什么不用fotget? take the second turing on the left 为什么用take?而不用at? She stood on my left这句对吗 是例句 为什么不用by my left It's rude to put your hands in your lap.为什么用in 而不用on? carry on with your work..为什么he carried on reading不用,carry要变成carried _____(walk) along the street,and you'll find the resturant on you left.空格处答案为：walk为什么要用walk而不用walking呢? stand on your left leg! we still have some time left.这句话中的left是什么意思?为什么不用leave?而要用过去式? I am on your left,leaning your left shoulder on your left 和 on you left哪个对 which floor do your parents live on?为什么用do不用are? I realized with a shock that I was the only passengers left on the bus.中left充当非谓语动词吗?如果是,为什么不用leaving而用left,它不是表主动关系吗? there was some egg and tomatoes left on the plate为什么 egg 不用复数 tomatoes复数 为什么一般现在时中的遗留用left而不用leave the building is on your left i didnit want to meet paul so when he entered the room i left为什么用left 不用have left