When I was first learning English, I found Asimov incredibly valuable, because he used fairly advanced vocabulary, but in sentences that were easy to follow and figure out from context.
Specifically "classics" might be tricky. There's lots of newer content for free online, including award-winning short stories - would those help?
Let me ponder what's available specifically classics-wise.
"The Ones Who Walk Away From Omelas" by Ursula LeGuin
A shorty but goody, "They're Made Out of Meat" by Terry Bisson
On the other hand, this here: https://www.sffaudio.com/public-domain-pdf-page/ seems to work ok if you type in an author name into the search box. I found a bunch of Asimovs, Sturgeons, Heinleins, so I recommend trying anyone you can think of and seeing if they have any.
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Specifically "classics" might be tricky. There's lots of newer content for free online, including award-winning short stories - would those help?
Let me ponder what's available specifically classics-wise.
"The Ones Who Walk Away From Omelas" by Ursula LeGuin
A shorty but goody, "They're Made Out of Meat" by Terry Bisson
Lots of things on Project Gutenberg. https://www.gutenberg.org/wiki/Science_Fiction_(Bookshelf) - I could probably pick out a few personal favorites.
But wait there's more: https://www.theverge.com/2017/7/14/15970710/galaxy-science-fiction-magazine-online-free-reading-archive - might require more digging to find specifics, so don't know how helpful it is.
On the other hand, this here: https://www.sffaudio.com/public-domain-pdf-page/ seems to work ok if you type in an author name into the search box. I found a bunch of Asimovs, Sturgeons, Heinleins, so I recommend trying anyone you can think of and seeing if they have any.
And so on...