i.e. vs e.g

Аббревиатуры i.e. и  e.g. имеют латинское происхождение.

i.e. = id est - то есть. 

В английском языке заменяет that is.

• Phonological variation affects the inventory of phonemes (i.e. speech sounds that distinguish meaning), and phonetic variation consists in differences in pronunciation of the phonemes.

e.g. = exempli gratia - например.

В английском языке заменяет for example.

• Regularisation of irregular forms also slowly continues (e.g. dreamed instead of dreamt), and analytical alternatives to inflectional forms are becoming more common (e.g. more polite instead of politer).