Meaning: The children made sandcastles on the beach.
Choice of Words: Children are young people. Built means made something by putting parts together. Sandcastles are structures made of sand. On means touching or resting on something.
Alternative Expressions
Kids constructed sandcastles on the seashore.
Meaning: This means the same as the first sentence. It's like saying, The young people made structures out of sand at the beach.
Choice of Words:Kids is another word for Children. Constructed is a more formal word for Built. Seashore is another word for Beach.
The young ones made sandcastles by the water.
Meaning: This also means the same as the first sentence. It's like saying, The kids built sandcastles near the water.
Choice of Words:The young ones is another way to refer to Children. Made is a simpler word for Built. By the water means close to the water.