know which is which
суметь различить, отличить одно от другого
Mark's house and Peter's house are so alike that I am often confused and don't know which is which.
Другие идиомы:
- know (something) inside out
- know (someone or something) like the back of one's hand
- know better (than to do something)
- know a thing or two (about someone or something)
- know (something) from memory
- know where all the bodies are buried
- know a trick or two
- know (something) by heart
- know one's place
- know what's what
- know the ropes
- know-how
- not know if one is coming or going
- not know the first thing about something
- know where (someone) stands on (something)