مستقیم

In a sentence

• من می‌خواهم به طور مستقیم با شما صحبت کنم.

  I want to talk with you directly.

  Here, "مستقیم" is used as an adverb meaning "directly" to indicate the mode of communication.

• این جاده مستقیم به شهر می‌رود.

  This road goes straight to the city.

  Here, "مستقیم" is used as an adjective meaning "straight" to describe the road's direction.

• آیا این خط تلفن مستقیم است؟

  Is this phone line direct?

  In this sentence, "مستقیم" is an adjective meaning "direct" to describe the type of phone line.