Learn English – “Effect” vs. “Affect”

These two are more or less equivalent. They can both be used for the situation where A and B speak to each other. "Speak to" can also be used for the situation where A talks and B listens without speaking.

As reported by the New Oxford American Dictionary:

e.g. /ˌi ˈdʒi/
abbreviation
for example.
ORIGIN from Latin exempli gratia (for the sake of an example).

i.e. /ˌaɪ ˈi/
abbreviation
that is to say (used to add explanatory information or to state something in different words): a walking boot that is synthetic, i.e., not leather or suede.
ORIGIN from Latin id est "that is."

E.g. is used in expressions similar to including, when you are not intending to list everything that is being discussed.
I.e. is used when what you are introducing is equivalent to or an explanation of what comes before it in the sentence.

I like root vegetables, e.g., potatoes.

I like root vegetables; i.e., the ones that grow underground.