Always.
The word "ever" is correct and usable in written English. You can use it as an adverb to emphasize an action or statement. For example, "I have ever seen anything so beautiful.".
He was one of the most gentle and unflappable politicians I have ever known, yet he was immensely courageous, too, not least when he spoke for the country against the invasion of Iraq".
It was ever thus.
"With Rick gone, and with him the chance of ever doing it again, it feels right that these revisited and reworked tracks should be made available as part of our repertoire".
There is a need to lay out more clearly than ever before what being a British Muslim means today: proud of your faith and proud of your country.
You are the most ghastly man I have ever known.
Not ever".
Whether the Earth was created in 7 days, or 7 actual eras, I'm not sure we'll ever be able to answer that.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union