هایی

In a sentence

• کتاب‌هایی که خواندم به من کمک کردند.

  The books that I read helped me.

  In this sentence, 'هایی' is used as a suffix to indicate the plural form of the noun 'کتاب' (book), referring to multiple books.

• افرادی که برای مهمانی دعوت شدند، آمدند.

  The individuals who were invited to the party came.

  Here, 'هایی' is also a plural suffix, modifying 'فرد' (individual) to indicate multiple individuals.

• چیزهایی که گفتی مهم هستند.

  The things you said are important.

  In this example, 'هایی' is a plural suffix attached to 'چیز' (thing), referring to multiple things.