This is a download from BBC Learning English.
To find out more, visit our website.
Hello, and welcome to the English We Speak.
I'm Jiayin.
And I'm Neil.
Hi, Jiayin.
Have you seen any biscuits around here?
I'm really hungry.
No, sorry.
There aren't any biscuits here.
Maybe you should try looking in the kitchen rather than in the meeting room.
Well, I'm only looking in here because Rob promised to leave some biscuits on the table.
Yeah, right.
That'll be the day.
Oh, have I got the wrong day.
Did he say he would leave the biscuits on another day?
I didn't miss them, did I?
No, Neil, calm down.
I said that'll be the day.
We use this expression to say that we don't think something will happen.