Learn Turkish: Hamallar inleye inleye kutuları aşağı taşıdı. - The movers carried the boxes downstairs, groaning.

It comes from the verb inlemek (to groan). To form this manner converb, we take the root inle-. Because the root ends in a vowel, we add the buffer letter -y- before the -e suffix. Repeating it as inleye inleye shows that the groaning was a continuous action happening while they carried the boxes.

Why is the word for 'downstairs' just aşağı instead of aşağıya with a dative ending?

In Turkish, spatial words like aşağı (down), yukarı (up), içeri (in), and dışarı (out) often act as plain adverbs and drop the dative case ending (-e/-a) when placed directly before a verb of motion. Saying aşağı taşıdı is the most natural way to say 'carried down'.

Why does kutuları have an -ı at the end?

The base plural word is kutular (boxes). The final -ı is the accusative case suffix. We need it here because the movers are carrying specific boxes ('the boxes'), making them the definite direct object of the sentence.

Could we change the word order and put inleye inleye later in the sentence?

Yes, you could say Hamallar kutuları inleye inleye aşağı taşıdı. Turkish word order is flexible. Placing inleye inleye right before the verb phrase puts a bit more emphasis on how the action was done, while putting it earlier is just as natural.