There is a group of adverbs known as adverbs of time, following are some examples:
sempre always
mai never/ ever
ancora still/ yet
non ancora not yet
già already
ora/adesso now
presto early
tardi late
This group of adverbs follows the same guidelines explained above. The adverbs già and ancora (versus non ancora) require close attention. Following are some examples:
Sono già le undici. = It’s already eleven o’clock.
Era ancora in giro alle due. = She was still out at two o’clock.
La posta non è ancora arrivata. = The mail still hasn’t arrived.
Ero già uscito per andare a lavoro e non era ancora rientrata! = I had already left for work and she hadn’t come home yet!