我在以前的邮件中提到过很多次。 翻译为英文是： I mentioned it many times in my previous mail. 注： 请提问者及时采纳答案，作为对回答者付出脑力和体力劳动的尊重。
翻译如下 我已经去过那儿很多次了 I've been there many times.
肯定来过这好多次了 I've definitely been here many times
谢谢，我知道了，下次我会注意的 Thank you! I've got it. I will pay attention to it next time.
we have discuss over/on(前面这两个选哪个主要看你描述的问题的大小) this problem for many times
我一提到他上次失败的经历 翻译是： I mentioned the experience of his last failure
在人的一生中有许多第一次 During a people's whole life, there were a dozen of "debut" occasions.
i have competed against him many times in the past, and i have more defeats than wins against him.
i have some experiences of living alone at several cities in China