castle in the air

NOUN

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How To Use castle in the air In A Sentence

Instead of working hard at her lessons, Mary spends her time building a castle in the air.
Your scheme is merely a castle in the air.
Instead of working hard at her lessons, Mary spends her time building a castle in the air.
Instead of working hard at her lessons, Mary spends her time building a castle in the air.
Your scheme is merely a castle in the air.
Instead of working hard at her lessons, Mary spends her time building a castle in the air.
Their plan is merely a castle in the air because it is simply impracticable.
Your plan is merely a castle in the air.