Przepraszam, czy to jest twój samochód?

A practical approximation:

• Przepraszam: pshe-PRA-sham (the rz sounds like English zh in vision)
• czy: chy (like a soft ch, similar to the start of hue for many speakers)
• to: toh
• jest: yest (Polish j = English y)
• twój: roughly tfoo-y (one syllable, with w close to English v/w depending on accent; ój is like oy)
• samochód: sa-ma-HOOT (stress is usually on the second-to-last syllable: -chód)

Often yes. In many situations you can say:

• Przepraszam, czy to twój samochód?
  This is very natural and common in speech. Keeping jest is also correct and can sound a bit more explicit.

Polish word order is fairly flexible, but the neutral, most common order here is:

• czy + to + (jest) + [possessive] + noun
  You might also hear:
• Czy to jest samochód twój? (possible, but sounds marked/unnatural in most contexts)
• To twój samochód? (very common as an informal “This your car?”)

twój means “your” (singular “you”). It changes form depending on gender/case:

• masculine singular (like samochód, which is masculine): twój
• feminine singular (e.g., torba “bag”): twoja
• neuter singular (e.g., auto “car” as neuter): twoje
• plural (masculine personal vs non-personal): twoi / twoje (depending on noun type)

Here it’s twój because samochód is masculine.

Use twój when speaking informally to someone you address as ty (friends, peers, family, many casual contexts).
For formal situations, you would typically say:

• Przepraszam, czy to jest Pana samochód? (to a man)
• Przepraszam, czy to jest Pani samochód? (to a woman)

It’s not grammatically required, but it’s a very natural polite opener. Przepraszam can mean:

• “Excuse me” (to get attention)
• “Sorry” (apology)
  Here it functions like “Excuse me,” making the question polite.

• to is a general “this/that/it,” often used in sentences like To jest… / Czy to…?
• ten/ta/to are demonstratives that agree with gender: ten samochód = “this car” (masculine)

So you could also ask:

• Przepraszam, czy to jest ten samochód? = “Excuse me, is this the (particular) car?”
  But for “Is this your car?” the given czy to jest twój samochód? is the standard pattern.

Yes, it’s very similar. auto is common and is neuter, so you use twoje:

• …twoje auto?
  samochód can sound a bit more formal/standard; auto is very everyday.

Common answers:

• Tak, to mój samochód. = “Yes, it’s my car.”
• Nie, to nie jest mój samochód. / Nie, to nie mój samochód. = “No, it’s not my car.”
• Tak, to jest mój. (if the object is obvious) = “Yes, it’s mine.”