Learn Turkish: Yeni döşemeyle arabanın içi pırıl pırıl olmuş olacak. - With the new upholstery, the inside of the car will have become gleaming.

This is the Future Perfect tense. We take the main verb olmak (to become), add the suffix -muş to show a completed action, and then add the future auxiliary olacak (will be). Together, olmuş olacak means that by a certain point in the future, the state of becoming gleaming will be fully complete.

Why is pırıl repeated as pırıl pırıl?

In Turkish, repeating words is a common way to emphasize them or create vivid adjectives. The word pırıl on its own isn't really used, but the doubled phrase pırıl pırıl is a common expression meaning "gleaming," "sparkling," or "spotlessly clean."

What is the -yle at the end of döşemeyle?

It is the suffix form of ile, which means "with." The root word is döşeme (upholstery). Because it ends in a vowel, we add the buffer letter -y- before the suffix -le, creating döşemeyle (with the upholstery).

Why is it arabanın içi instead of just araba içi?