How do I say "belong to" in Latin?

5 answers

What is the entire sentence? There is not always a word for word translation between English and Latin.
The new book will belong to the consul
In English, the concept of something that belongs to someone is handled in Latin with the genitive case; it's the same concept as possessive in English.

So you need to rephrase that sentence like this:
The new book will be the consul's.

Now ... how will you set that up? This is awkward phrasing in English, but it'll work when you determine the Latin words in the right cases:
The new book will be of the consul.
Another possibility is to use the dative, as in your other post. Put "consul" in the dative case (instead of genitive) and the sentence will literally say this: The new book will be for the consul.
PS -- here are some really good websites for you, in addition to the textbook you're using.

http://econrad.net/latin/

http://archives.nd.edu/latgramm.htm

http://www.slu.edu/colleges/AS/languages/classical/latin/tchmat/gr-helps.html

Post your sentence when you're ready.