Learn Turkish: Bu iş yalnızca bir kişiyle biter. - This job gets done with only one person.

You could express the same exclusive idea by saying Bu işi bir kişiyle yapmaktan başka yol yok (There is no way other than doing this job with one person). The original sentence simply uses the adverb yalnızca (only) for a more direct, positive phrasing.

The verb bitmek usually means 'to end' or 'to finish'. Why is it translated as 'gets done' here?

When talking about tasks, chores, or work (iş), bitmek naturally implies that the work is successfully accomplished or completed, rather than just coming to a stop. It is very common in Turkish to say a job 'finishes' rather than someone 'finishes the job'.

Why does this sentence use the aorist tense (biter) instead of the present continuous (bitiyor)?

The aorist is used here to state a general truth, rule, or capacity regarding this job. It tells us 'this job is of the nature that it can be done with one person', rather than describing an action happening right at this moment.

What is the difference between yalnız and yalnızca here?

While both can mean 'only', adding the adverbial suffix -ca emphasizes the restriction, translating closer to 'strictly' or 'merely'. In everyday usage, yalnızca and sadece are perfectly interchangeable in this sentence.