Building sandcastles.

Meaning: This means that someone is constructing or creating a structure made of sand and water on a beach. It's like saying, Someone is making a sandcastle using sand and water.

Choice of Words: Building is an action verb that means to construct or create something. Sandcastles is a noun that refers to a structure made of sand and water, often built on a beach as a form of play. When used together, they create a sentence that expresses a common activity that children do.

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Related Expressions