Karl Fogel at
It is one of the mini-tragedies of the English language that there is no prefix adverbial option for "early".
"The test allows us to earlily detect..." Bzzzt! Sorry, you must put "early" *after* the verb, where it fails to convince as an adverb and interferes with other things.
I simply don't know why I wasn't consulted when these things were being decided.
(And anyone who tells me to "just write around it" will be zapped from orbit, so please don't even _think_ about it.)
the important question IMHO is how come early is not always an adverb, despite the '-ly' suffix, and how come it's not related with ears (or is it? :-)