Sorry, I'm only on book one but saw a beer advertisement and would really like to know what it means. (I'd add this to the end of question of 11, already submitted, but don't know how.) The sentence:
Watashi ni wa biiru desu.
I was thinking it might mean something like "As for me, beer" but that doesn't seem quite right. The other examples I've seen end in "have" type verbs, i.e. wouldn't ending in arimasu meant have a beer?
You may or may not know that NI can mark who an action goes to, the indirect object. In this case, WATASHI is the receiver of the action, but the action implied is "drink" ... The "wa" part just emphasizes that its "for me", as the topic of the statement.
So literally, "For me, it's beer (that I want, that I drink, etc.).