ان

In a sentence

• أعرف أنَّ السماء زرقاء.

  I know that the sky is blue.

  Here, 'أنَّ' is used as a subordinating conjunction to introduce a subordinate clause indicating a reported statement or fact.

• من الممكن أنْ ينجح في الامتحان.

  It is possible for him to pass the exam.

  Here, 'أنْ' is used as a particle to introduce a regular subjunctive verb in its bare form, denoting the infinitive in English.

• إنْ درَست بجد، ستنجح.

  If you study hard, you will succeed.

  Here, 'إنْ' is used as a conditional particle to introduce a conditional clause indicating a scenario or assumption.