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### Background

I am currently studying Japanese grammar at a beginner's level. Yes, I am
familiar with Hiragana but I have not quite learnt Katakana yet. Obviously, I
know Romaji and hardly much Kanji.

### Problem

However, I came across the formal and informal way of using "suki" (すき). I
know "desu" is required if you were to say to your boss "I like apples" but is
"da" really necessary for informal? I mean, is it as polite if you went
without it? Is it grammatically correct or right to go without it?

For example, what's the difference between りんごが好き ("I like apples") and and
with だ on the end (sentence + grammatical particle perhaps?)
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2018-08-13T11:38:12.007
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grammar
すき ("suki") vs すきだ ("sukida")
I think that sukida is more casual, whereas suki have a sense of
lightheartedness to it. Just my personal opinion:P
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2018-08-13T13:01:49.990
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answer
Including sentence-final だ is a marker of **blunt-style** speech, typical of
males. The alternate without だ is more apt to be used in feminine/gentle
speech.

For more detail on this particular nuance, see this question:

[Is "da" used often in the casual
speech?](https://japanese.stackexchange.com/questions/35893/is-da-used-often-
in-the-casual-speech/35895)

And for information about other patterns typical of blunt/gentle speech
styles, see this question:

[What differences should I look out for between male vs female
speech?](https://japanese.stackexchange.com/questions/97/what-differences-
should-i-look-out-for-between-male-vs-female-speech)
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2018-08-13T14:03:47.200
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Well, 好き{すき} could be translated as "something that someone likes" (it means
"to like" but it's an adjective). So if you want to say "I like apples" you
must say りんごが好{す}きです. だ is the informal version of です. If you are with your
friends, you should say りんごが好き{すき}だ. But sometimes people (particularly women)
skip だ when talking in colloquial speech. So you could leave it in りんごが好き{すき}.

To summarise, 好き{すき} is an adjective, that may be alone (informal, femenine),
with だ (informal in general) or with です (formal).
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2018-08-15T17:23:22.747
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answer