Learn Turkish: Yolda kaza var, bu nedenle otobüs gecikiyor. - There is an accident on the road, therefore the bus is running late.

It is made up of three parts: bu (this) + neden (reason) + -le (the instrumental suffix meaning 'with' or 'by'). Literally, it means 'with this reason' or 'for this reason', which we translate as 'therefore' or 'that is why'.

Could I use the other conjunctions from this lesson, like bu yüzden or bunun için, in this sentence?

Yes! You can say ...bu yüzden otobüs gecikiyor or ...bunun için otobüs gecikiyor. They all mean 'that is why' or 'therefore' and are almost completely interchangeable, though bu nedenle can sound a little bit more formal in everyday speech.

Where does the verb gecikiyor (is running late) come from?

The base verb is gecikmek (to be delayed or to become late). It actually comes from the common adjective geç (late). With the present continuous tense suffix -iyor, it describes that the bus is currently being delayed.

Just as a refresher, why is there a -da attached to yol?

The suffix -da (or -de) is the locative case, which tells us where something is happening (in, on, or at). Since yol means 'road', adding -da makes it yolda, meaning 'on the road'.