ஏன

In a sentence

• நான் ஏன் இங்கு வந்தேன்?

  Why did I come here?

  Here, 'ஏன்' (why) is used as an interrogative adverb to ask a question about the reason behind an action.

• எனக்கு ஏன் இவ்வளவு சோர்வு இருக்கிறது என்று தெரியவில்லை.

  I don't know why I feel so tired.

  In this case, 'ஏன்' (why) is used within an embedded question to indicate the cause or reason associated with a state or feeling.

• அவர் ஏன் அண்மையில் அழைத்தார் என்று புரியவில்லை.

  I didn't understand why he called recently.

  Similarly, 'ஏன்' (why) functions in describing the unknown reason for someone's action.