“Why on Earth would I do that?”

English Lesson: Why on Earth would I do that?

Your car is old and has a lot of engine problems, but you love it because you have good memories of it. Your sister suggests that you sell it. Although you know that the car should be sold, you want to pretend to be shocked that she would suggest selling it, so you say this.

Why on Earth would I do that?

(Why/How/What) on Earth (question)?

Starting a question with "Why on Earth...?" or "How on Earth...?" shows that you feel totally surprised by the thing that you're asking about. For example:

How on Earth did you get up there?

This is something you can ask someone who's standing on the roof of a house unexpectedly.

What on Earth are you talking about?

Ask this when someone says something really confusing.


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