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) only too well
- know-it-all
- know (something) backwards and forwards
- know a trick or two
- know a thing or two (about someone or something)
- not know if one is coming or going
- know (something) inside out
- know (something) by heart
- know what's what
- know one's own mind
- know all the tricks of the trade
- know-how
- know when one is not wanted
- know (someone) by sight
- know (someone or something) like the back of one's hand