Hi teacher!
As a non native speaker of Enhlish, #1 sounds odd to me. I wonder how you native speakers say and how the each sentence is different in meaning from the others.
1. I was swimming at the beach
2. I was swimming in the sea.
3. I was swimming at the seaside. (?)
4. I was swimming in the pool at the hotel.
5. I was swimming at the hotel. (?)
As always, many thanks native teachers ??
Michelle Cha 1. I was swimming at the beach. 2.
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Michelle Cha1. I was swimming at the beach.
2. I was swimming in the sea.
3. I was swimming at the seaside. (?)
4. I was swimming in the pool at the hotel.
5. I was swimming at the hotel. (?)
To me, these are all possible.
(3) has a flavour of someone talking about their summer holiday by the sea. "the seaside", in this sense, may