What are you doing if you are ....?

English as a Second Language English Vocabulary, Grammar and Idioms
1

What do you think you are doing if you …?

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2

I think if you are building castles in the air you are making plans that are unreal and too far-tetched.

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3

Yes, indeed - plans that have no substance, no solid foundation.

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4

A person who building castles in the sand often does so with their head in the clouds.

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