Learn Icelandic: Mér finnst ísinn ekki góður. - I do not think the ice cream is good.

This uses a "quirky subject." When you express an opinion using the verb finnast (to think/to seem), the person having the opinion goes into the dative case. Mér is the dative form of ég (I). Literally, this sentence translates to "To me, the ice cream seems not good."

Why does the verb finnst end in -st?

The -st ending marks a special verb form that often changes the meaning of the base word. The base verb að finna means "to find" physically, but adding -st makes it að finnast, which means "to seem" or "to have an opinion."

Why is the adjective góður instead of gott?

Adjectives must match the gender of the noun they describe. Because ís (ice cream) is a masculine noun, the adjective "good" must take the masculine form góður. If you were talking about a neuter word like epli (apple), you would use gott.

Where is the word for "the" in this sentence?

In Icelandic, the word for "the" is attached to the end of the noun instead of being a separate word. Ís means "ice cream," and adding the masculine ending -inn makes it ísinn (the ice cream).