to butter somebody up 夸赞和奉承某人，也包括发自内心的夸奖

easy as pie 易如反掌

To be caught with one's hand in the cookie jar.

逮个正着。

This examination was as easy as pie.

这个考试太简单了。

You can't have your cake and eat it too.

鱼与熊掌不可兼得。

You’ll have to butter him up a bit before he lend you some money.

他借给你钱之前，你最好拍拍他马屁。