Broşürü okurken sloganı hemen fark ettim; akılda kalıcı.

-ken means “while/when” and turns a verb into an adverbial clause of time. Okurken = “while (I was) reading.”

• Formation: verb root oku-
  • aorist -r
    • -ken → okur-ken → okurken.
• You may also hear okuyorken (present continuous stem okuyor
  • -ken), which makes the ongoing nature of the action a bit more explicit. Both are natural; okurken is very common and idiomatic.

That is the definite accusative, used for specific, definite direct objects.

• broşür → broşürü (“the brochure” as a specific object)
• slogan → sloganı (“the slogan” as a specific object) Without the accusative, they would be indefinite (“a brochure,” “a slogan”): broşür okurken, bir slogan fark ettim.

The form sloganı is ambiguous out of context: it can be

• accusative “the slogan,” or
• nominative with 3rd person possessive “his/her/its slogan” (as a subject or topic), e.g., Onun sloganı çok kısa. In your sentence, after a verb, sloganı is clearly the definite object (“the slogan”). If you wanted “I noticed his slogan,” you’d say: Onun sloganını fark ettim (possessive + accusative).

Fark etmek is a light-verb compound (“to notice”), written as two words. When conjugated:

• etmek → ettim/etti/ettin (the t doubles before past tense suffixes). Common errors to avoid: don’t write farketmek or farkettim as one word. Correct: fark etmedim, fark ettin mi?

Hemen means “immediately/right away.” It most often appears before the verb or just before the object:

• Sloganı hemen fark ettim (very common)
• Hemen sloganı fark ettim (also fine; slightly more emphasis on “immediately”) Note: hemen hemen together means “almost/nearly,” which is a different meaning.

Yes, a period would also be fine. The semicolon links two closely related independent clauses. The second clause is a nonverbal sentence with an implied subject (“It is memorable”). You could also write:

• Akılda kalıcı. (casual, present-time assessment)
• Akılda kalıcıydı. (if you want past-time consistency: “it was memorable”)
• Akılda kalıcıdır. (more formal/assertive)

Literally “staying in the mind,” hence “memorable.”

• akıl = mind
• -da = in/at (locative)
• kal- = to stay/remain
• -ıcı = adjectival/agentive suffix Together: akıl-da kal-ıcı → “mind-in staying,” i.e., memorable.

By default, the subject of the -ken clause is the same as the main clause: “While I was reading the brochure, I noticed…” If you need a different subject, you can state it:

• Sen uyurken, ben çalışıyordum. = While you were sleeping, I was working. You can also add a pronoun for clarity: Ben broşürü okurken…

Yes, but they’re not identical:

• okurken = “while reading” (simultaneous/overlapping action).
• okuduğumda = “when/at the time that I read” (more event-pointed).
• okuyunca = “when/once I read” (often implies immediate consequence). Your sentence focuses on simultaneity, so okurken is the most natural.

Yes. Verbal -ken clauses are still verbal environments, so definite direct objects take the accusative:

• Broşürü okurken (definite: the brochure)
• Broşür okurken (indefinite: a brochure / brochure-reading in general)

Turkish word order is flexible for emphasis. Natural variants include:

• Broşürü okurken sloganı hemen fark ettim.
• Sloganı hemen, broşürü okurken fark ettim. (emphasizes the object first)
• Hemen sloganı fark ettim, broşürü okurken. (afterthought style) The neutral, smooth flow is adverbial clause → object → adverb → verb, as in your sentence.

Both mean “to notice/realize,” often interchangeable.

• fark etmek: very common and neutral for “notice.”
• farkına varmak: slightly more “to become aware/realize,” sometimes a bit more formal or cognitive. Another common alternative is dikkatimi çekti (“it caught my attention”).

The -r comes from the aorist stem. For many verbs, the aorist is formed with -r/-Ar, and the -ken converb attaches to that:

• oku-r-ken → okurken (read)
• yürü-r-ken → yürürken (walk)
• bak-ar-ken → bakarken (look)