اگر

In a sentence

• اگر باران ببارد، به خانه می‌رویم.

  If it rains, we will go home.

  In this sentence, 'اگر' is used to introduce a conditional clause, expressing a condition for the stated outcome.

• به کلاس بیا اگر وقت داری.

  Come to the class if you have time.

  Here, 'اگر' connects the suggestion to the condition that the person has time, denoting a requirement for the action.

• اگرچه هوا سرد است، اما من بیرون می‌روم.

  Although the weather is cold, I will go outside.

  In this sentence, 'اگرچه' is a derivative of 'اگر', expressing a contrast between the circumstances and the action.