But I have to make sure that you keep this from your friends.但我得确保你不会告诉你的朋友们

make sure弄明白； 设法确保

I'm going to make sure if I'm going to Macao.

我要拿定主意我是否去澳门。

Make sure his appointment doesn't clash with mine.

一定不要让他的约会跟我的约会订在同一个时间。
keep from阻止, 妨碍

I hope you will keep from doing nothing rash.

我希望你不要做出任何鲁莽的事情来。

She bit her lip to keep from crying.

她咬着嘴唇克制着自己不要哭。

I promised I wouldn't keep anything from you.我保证过不隐瞒你任何事

promise, allow这两个词都可译为“答应”,其区别是：

allow含义是“允许”,而promise含义是“应承”。例如：

He has allowed me to come.

他允许我来。

He promised me to come.

他答应我他会来。

If it got out before the police...如果消息在警局公布之前就走漏了...

get out泄漏

I wouldn't want it to get out on him.

我不想他把这一秘密泄露出去。