Learn Portuguese (Portugal): A sopa fria não é boa.

In English, we put the describing word before the noun. In Portuguese, adjectives usually come right after the noun they describe. So, it translates word-for-word as soup cold.

Why do both fria and boa end in the letter a?

Because they both describe the noun sopa (soup), which is a feminine word. In Portuguese, adjectives must match the gender of the noun. If we were talking about a masculine word like o prato (the plate), we would use the masculine forms: frio and bom.

Where does the word não go when making a negative sentence?

To make a sentence negative in Portuguese, you simply put the word não directly before the verb. Here, it goes right before é (is) to mean is not.

Why does this sentence use é instead of está?

We use é (from the verb ser) here because we are stating a general opinion about the quality of the cold soup. If you were at a restaurant and your hot soup arrived cold by mistake, you would use está (from the verb estar) to describe that temporary state: a sopa está fria.