I want to reinforce the exact difference between these two prepositions used in the same sentence.
I'll go for a walk in the seaside.
I'll go for a walk at the seaside.
Is it grammatically wrong to say that we can use both?
There is no grammatical question here: it is simply one of usage.
At the seaside is idiomatic: in the seaside is not.
Go for a walking is not idiomatic: go for a walk is.
answered Nov 20 '18 at 17:00
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So, can't I use ''in''? – Enzo Nov 20 '18 at 17:02
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It's grammatical, and it would be understood. But it's not what a native speaker would say. – Colin Fine Nov 20 '18 at 17:04
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@Enzo If you use in people will notice and write it off as a non-native speaker error. – Dan Bron Nov 20 '18 at 17:06
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@enzo I'd say the most common preposition is along the seaside or alongside the (beach / shore / sea). People don't normally go for a walk at the seaside either. (Although it's a lot more common than in the seaside, which is simply bizarre.) However, people do go for a seaside walk, which dispenses with a preposition altogether. – Jason Bassford Nov 20 '18 at 19:15
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