Know chalk from cheese informal verb phrase
To be able to distinguish between two individuals or objects (especially by recognizing their differences).
A: I quiz you. Which twin is Nam? B: I can know chalk from cheese. Nam has a birthmark on his neck, and Jack doesn't.
To have no influence on someone, either positive or negative.
Long distance
It is a fur piece from my house to my school, so I would rather catch the bus than ride a bike.