know one's ABCs
знать основное о чём-либо, иметь базовые знания
The woman in the library knew her ABC's and could quickly give me the information I needed.
Другие идиомы:
- know (something) in one's bones
- know one's own mind
- know a thing or two (about someone or something)
- know the ropes
- know a trick or two
- know (someone or something) like the back of one's hand
- not know if one is coming or going
- know (something) inside out
- know where all the bodies are buried
- know the score
- not know the first thing about something
- know-how
- know all the tricks of the trade
- know which is which
- know one's place