Learn Farsi: پس‌فردا راجع به برنامه‌ی آخر هفته صحبت می‌کنیم. - The day after tomorrow, we will talk about the weekend plans.

In everyday spoken and informal written Farsi, the formal future tense with خواهـ (khâh-) is rarely used because it sounds too rigid or distant. Instead, we use the present indicative (می‌کنیم) combined with a future time expression, which in this case is پس‌فردا (the day after tomorrow). The time word makes it perfectly clear that the action is happening in the future.

How does the phrase راجع به work, and why is it written with the letter ع?

راجع به (râje' be) is a very common way to say "about" or "regarding." The word راجع comes from Arabic, which is why it ends with the letter eyn (ع). Though the eyn is practically silent in Persian, in fast, casual speech you will often hear native speakers merge the two words and pronounce the whole phrase as راجبه (râjeb-e).

Can I replace راجع به with another word for "about" in this sentence?

Yes, you can easily swap it out for درباره‌ی (darbâre-ye). If you do, the sentence becomes پس‌فردا درباره‌ی برنامه‌ی آخر هفته صحبت می‌کنیم. Notice that درباره‌ی uses an ezafe (the linking vowel) to connect to the next word, whereas راجع must always be paired with the preposition به.

Can you break down the ezafe chain in برنامه‌ی آخر هفته?

This is a double chain linking three nouns: "plan of the end of the week." The first word, (plan), ends in a silent (ه), so the is written with an explicit to create (barnâme-ye). The second word, (end), ends in a consonant, so it simply takes the unseen vowel sound to connect it to (week).