नहीं जानते कि

don't know …

→ नहीं
phrase Uncommon #5,329
don't know … Introduces information or an indirect question that someone does not know; कि often translates as “that” and may be omitted in English.
HI: हम नहीं जानते कि स्टेशन कहाँ है।
EN: We don't know where the station is.