Breakdown of Уж он-то знает дорогу.
он
he / it (for a masculine noun) / it (for a neuter noun)
знать
to know
дорога
road, way
уж
indeed, really (emphatic particle)
Questions & Answers about Уж он-то знает дорогу.
What exactly are уж and -то doing in this sentence?
They work together to heavily emphasize the subject, он (he). Уж acts as an emphatic particle meaning 'certainly' or 'really,' while the suffix -то highlights the exact word it is attached to. Together, the уж [word]-то combination expresses: 'If anyone does, it is [X]' or '[X], of all people.'
Is уж here just a shortened, colloquial form of уже (already)?
Not in this context. While уж can sometimes be a short form of уже, here it functions purely as an emphatic particle. It has nothing to do with time; it only serves to strengthen the speaker's certainty.
Could I attach the -то particle to a different word in this sentence?
Yes, and it would completely change the nuance. The particle -то singles out whatever it attaches to. If you said Уж дорогу-то он знает, the focus shifts to the object: 'He might be clueless about other things, but he certainly knows the WAY.' By attaching it to он, the sentence implies 'HE definitely knows the way (even if the rest of us are lost).'
Why use дорогу for 'the way' instead of путь?
While путь translates to 'path' or 'way,' it often feels a bit more abstract, poetic, or refers to a grand journey. Дорога literally means 'road,' and the phrase знать дорогу is the standard, everyday Russian equivalent for 'knowing the way' to a physical destination.