How do I say "belong to" in Latin?

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.

To find out how to say "belong to" in Latin, we can start by looking up the word "belong" in an English-Latin dictionary. One reliable online resource for Latin translations is the website Latdict.com.

Step 1: Open a web browser and go to https://latdict.com/

Step 2: In the search bar, type "belong" and hit Enter.

Step 3: On the search results page, you will see a list of Latin words related to "belong." One possible translation for "belong" in Latin is "pertineo," which means "to pertain."

Step 4: Next, we want to find the Latin translation for the preposition "to". In Latin, the preposition "to" can be translated as "ad."

Step 5: Now, to form the phrase "belong to" in Latin, we can combine the verb "pertineo" (to pertain) with the preposition "ad" (to). Therefore, "to belong to" in Latin can be translated as "pertineo ad."

So, the Latin translation for the phrase "belong to" is "pertineo ad."