The phrase "is always left" is correct and usable in written English.
It can be used to indicate that something is consistently remaining or not taken away in a particular context.
Example: "After the meeting, the agenda is always left on the table for reference."
Alternatives: "is consistently remaining" or "is perpetually set aside."
Exact(18)
Jewellery is always left on the body.
This is the sound of a writer whose pilot light is always left on.
Whenever he stops to check a vehicle or speak to a hunter, his truck door is always left open, the engine running.
Among Mary's frustrations is that the story is always left incomplete, that the end, like Godot, seems destined never to arrive.
The bidder's video included a vox pop, in which Welsh people pointed out that north Wales is always left out of the news agenda.
It's just that, in my case, I point my camera at the part of the building that is always left out, avoided, denied.
Similar(40)
"My son is always leaving," she writes.
"The American," Ryszard declares in a letter, "is someone who is always leaving everything behind".
Love is always leaving the door unlocked and continuing that love when 'other' may choose to use the exit.
"Someone is always leaving everywhere": that's the idea behind Roadie, a peer-to-peer package delivery service launched last year by Marc Gorlin.
Someone was always left out, momentarily bereft.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com