Learn Russian: Редактор спросил, перечитал ли я текст, чтобы найти опечатки. - The editor asked whether I reread the text to find typos.

The prefix пере- often indicates repeating an action, similar to the English prefix 're-'. By adding it to the base verb читать (to read), we get перечитать (to reread). This is a perfective verb because it refers to successfully completing that repeated action.

Why does the sentence use ли instead of если for 'whether'?

A common trap is trying to use если for all meanings of 'if'. In Russian, если is strictly for conditions (If X happens, then Y). For indirect yes/no questions like asking whether or wondering if something happened, you must use the particle ли. It is placed immediately after the word in question, which is usually the verb (перечитал ли я).

Why is чтобы followed by the infinitive найти?

The word чтобы translates to 'in order to'. When the person performing the action is the same in both parts of the sentence (I reread the text in order for me to find typos), чтобы is followed by an infinitive verb. Also, remember that Russian always requires a comma before чтобы.

Where does the word опечатки (typos) come from?