It completely slipped my mind. Honestly.老實說我真的忘記這事了
slip one's mind忘記
It slipped my mind that I was visiting him today.
我忘了今天要訪問他的事。
I'm sorry I forgot your birthday; it completely slipped my mind.
我很抱歉忘了你的生日,我完全記不得了。
with everything that's going on,I totally spaced about Emily's party.發生這一切之后我完全忘了艾米麗的派對
go on發生
Are you alive to what is going on?
你注意到正在發生的事嗎?
The new play will go on the boards next month.
這出新戲將在下個月上演