1.lose track of跟不上…的进展;不再掌握…的最新情况
可以引申一下，就可以很委婉地表示“忘记”了什么，如：
It's so easy to lose track of who's playing who and when.
很容易就忘记谁要和谁比赛，什么时候比。
His mind would wander, and he would lose track of what he was doing
他会走神，忘了自己正在干什么。
You become so deeply absorbed in an activity that you lose track of time
你会因过于专注某项活动而失去时间概念。（就是忘记了时间的意思）
2.slip my mind（强调不小心）忘记了……
I'm so sorry your birthday completely slipped my mind.真的对不起，我不小心忘了你生日。
You slipped your mind to tell me it.
你忘记要告诉我这件事。
slip your mind
被遗忘
The reason for my visit had obviously slipped his mind.
他显然已经忘掉了我的来意。
《柯林斯高阶英汉双解学习词典》
最后分享一句给朋友们，一起共勉：
We must not let our youth slip idly by.
我们不能让青春虚度。
《汉英大词典》
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