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1·I was going to mention it, but it slipped my mind.

我正要说到它，可是想不起来了。《柯林斯英汉双解大词典》

2·Sorry, it slipped my mind.

对不起，我不小心给忘了。

3·I was just so busy it slipped my mind.

但是我太忙了，所以忘记了。

4·It slipped my mind.

从大脑里溜走了。

5·I did mean to call her, but it slipped my mind.

我确实想打电话给她，但不留神我忘记了。

6·It slipped my mind that I was visiting him today.

我忘了，我今天去拜访他。

7·It slipped my mind that I had to turn in my homework by ten.

我忘记了我必须在十点前就交作业。

8·Oh right, it slipped my mind. Why do you celebrate two New Years?

喔，对了，我都忘了。你们为什么要庆祝两个新年啊？

9·I meant to tell you your girl friend had called, but it slipped my mind.

我本想告诉你，你的女朋友来电话了，但是我把这事给忘记了。这下你会用了吧！

10·I meant to tell you your girl friend had called, but it slipped my mind.

[解释]蟩忘记了。没记住。我本想告诉你，你的女朋友来电话了，但是我把这事给忘记了。