Ĉe tiu angulo vi devas iri maldekstre.

At that corner you must go left.

Breakdown of Ĉe tiu angulo vi devas iri maldekstre.

• vi: you
• ĉe: at
• devi: must
• tiu: that

Questions & Answers about Ĉe tiu angulo vi devas iri maldekstre.

Why does the sentence start with ĉe? What does ĉe mean here?

Ĉe is a preposition that often means at, by, or near. In this sentence, Ĉe tiu angulo means something like At that corner or At that point/corner.

English often uses several different prepositions depending on context, but Esperanto ĉe is fairly broad. Here it tells you the place where the action becomes relevant: when you get to that corner, you should turn left.

Why is it tiu angulo and not tiun angulon?

Because ĉe is a preposition, and in normal Esperanto, prepositions are followed by the nominative, not the accusative.

So:

• tiu angulo = that corner
• ĉe tiu angulo = at that corner

You would use -n on a noun mainly for the direct object, or sometimes for direction in certain expressions. But after ĉe, you normally do not add -n.

What exactly does angulo mean? Is it really angle, or does it mean corner?

Literally, angulo means angle, but in everyday use it can also mean corner, especially in directions and street contexts.

So in this sentence, tiu angulo is naturally understood as that corner. A learner might think only of a geometric angle, but Esperanto uses angulo in the practical sense too.