2、来自PIE*ayer, 早晨，词源同ere, erstwhile. -ly, 形容词后缀。
2、early: [OE] Broken down into its equivalent parts in modern English, early means ‘before-ly’. It was a compound formed from Old English ǣr (ancestor of modern English ere ‘before’) and the adverb ending -ly, modelled probably on the parallel Old Norse form árligr. Ere itself was actually originally a comparative form, which before it was used for ‘before’ meant ‘earlier’.Old English ǣr came from prehistoric Germanic *airiz, the comparative form of *air ‘early’. Related forms in other Indo-European languages, such as Greek eri ‘in the morning’ and Avestan (the sacred form of Old Iranian) ayarə ‘day’, suggest that its underlying meaning is ‘early in the morning’.=> ere
4、Old English ærlice"early,"from ær"soon, ere"(see ere) + -lice, adverbial suffix (see -ly (2)). Compare Old Norse arliga"early."The adjective is Old English ærlic. The early bird of the proverb is from 1670s. Related: Earlier; earliest.