Dlaczego jest "lubię koty" a nie "lubię kotów"? bo koty tutaj jest mianownik. Nie mówimy "lubię kot", mówimy "lubię kota". Jest to samo z słowem "brat". Lubię brata, mam braci.
Cat is not a person so in plural it goes to the (not masculine personal) category with all objects, animals and women.
In plural Accusative koty= Nominative koty. Just like lubię film (Acc=Nom ) - masculine not animated singular
That's a huge difference between Polish and Russian. Russian only has animate or inanimate. It's strange to hear Lubię dziewczyny for a Russian because women are not objects. Diewuszki change to Ja liubliu diewuszek in accusative, just like the singular in Russian and Polish.
It's an interesting difference. I use my Russian to help me with Polish. In Russian, kot is considered animate noun. Ja liubliu kotow
In Polish it depends if it is singular or plural.
Animate not personal masculine nouns (kot) have
Singular Accusative=singular genitive lubię kota
plural accusative= plural nominative lubię koty
No it's not. English verbs "like" and "love" don't have the same distinction as Polish "lubić" and "kochać" do. If I'm not talking about a person, "I like" and "I love" (cats, beer, music, etc) mean practically the same. In other Duolingo lessons "like" and "love" are accepted as interchangeable words.
"love" is definitely stronger and some people even complained that the idea of loving things is weird in English (and some argued the same about Polish).
If any sentence accepted them interchangeably (which would really surprise me), that's a mistake. This is not Russian.
I see you learned English at Duolingo and your English is great but it's not your mother tongue, is it? I'm not a native English speaker either, I only live in USA for 20 years and professionally translate to English, so don't take my word for it. Please check English language sources and you will see that the phrase "I love cats" has about 3,620,000 results on google. If you think all of them are mistakes, you will have to teach millions of native English speakers how to properly speak their mother tongue.
Duolingo teaches the basics of the language, so I don't think a person who only learned English here could moderate any course. No, I've learned English most of my life and I'm writing my MA thesis in English Philology. Sure, I'm not a native speaker of English and also I have never lived in an English-speaking country.
I have absolutely nothing against "I love cats" as a sentence. Nothing, why would I? Many people love cats. It's just not a correct translation of the Polish sentence. The verb "lubić" translates to "to like"; the verbs "kochać" and "uwielbiać" translate to "to love". Seriously, there's nothing more to it. Whatever one's personal approach to using those verbs is, that's irrelevant. They have direct translations. And there's no benefit in allowing people to mix them. And it it's allowed somewhere, it should not be.