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Questions & Answers about Мне нравится летнее море.
Why does this sentence start with Мне instead of Я?
In Russian, to say you like something, you literally say that it is pleasing to you. Мне is the dative case of я (I), meaning to me. So the sentence is literally built as: To me is pleasing the summer sea.
Why do we use нравится here instead of нравятся?
The verb must match the thing you like, because grammatically, that thing is the subject doing the pleasing! Since море (sea) is a single thing, we use the singular form нравится. If you liked plural things, you would use the plural form нравятся.
Why does the adjective летнее end in -ее? Doesn't the neuter ending usually look like -ое?
You are right that most neuter adjectives end in -ое (like новое or старое). However, the dictionary form for summer is летний, which is a soft-stem adjective. Because its stem ends in a soft sound, its neuter ending becomes -ее to match the neuter noun море.
So is море the subject or the object of this sentence?
In Russian, море is the subject! Even though sea is the object in the English translation, the Russian grammar works differently. The sea (море, in the nominative case) is the subject that is performing the action of being pleasing to you.