What's in it for me?
This is a useful phrase to use when someone asks you to do a favour and you want to know how you will benefit from helping them.
For example, your boss asks you to work back late and help cover the late shift. You are not really sure you want to do it so you want to see what they will offer to do in return.
Boss: Could you do me a favour and do the late shift tonight as we are short staffed?
You: I worked every evening last week. What's in it for me?
This way you can let your boss know they are in your debt.
Off the hook
Did you ever make a promise you had to break? Let's say you made a date to have coffee with your friend and something came up, when you called them to explain, they say "Actually, I am not able to make it for our coffee date....." You are "off the hook". You are no longer responsible for the coffee date being cancelled.
Do you know the feeling?
This has to be one of the weirdest phrases in English. We use "now then" to say, "Ok, let's get down to business" or "Ok, now that's finished, let's do what's really on the agenda".
Now then, I'd better get off to my next class.....
No big deal
This is an expression we use to say "it was nothing" or "no problem".
For example, you are taking your bags downstairs to the car and your friend offers to carry one for you.
Afterwards, you say: "Thanks, you're a great help!"
They say: "No big deal. Anytime!"
Try it next time.....
Do the math
Do the math is another way to say "think about it"...
For example: You and your friends want to go out for the evening but you only have one car and there are 9 of you.
Your friend says: Why don't we go in your car?
You say: I only have a Corolla and there are nine of us, we'd better call a taxi. You do the math.
Next time, try it out....