لكن

In a sentence

• أردت الخروج، لكن الطقس كان سيئًا.

  I wanted to go out, but the weather was bad.

  لكن here is used as a conjunction to introduce a contrast between the desire to go out and the unfavorable weather condition.

• هو ذكي ونشيط، لكن أحيانًا يتصرفُ بعشوائية.

  He is smart and active, but sometimes he acts randomly.

  لكن introduces a contradiction between positive qualities and occasional random behavior.

• لم أفهم الإجابة، لكنني سأحاول مجددًا.

  I didn’t understand the answer, but I will try again.

  لكن expresses a contrast between the lack of understanding and the intention to keep trying.