Vincent Teo Can I say, (a) They built a sandcastle on / at /by /along the beach. (b) They built a sandcastle by / on / at /along the seaside. (c) They built a sandcastle at / on / along the seashore.
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Vincent TeoCan I say,on
(a) They built a sandcastle on / at /by /along the beach.
(b) They built a sandcastle by / on / at /along the seaside.
(c) They built a sandcastle at / on / along the seashore.