Copula?! Desu,da!!
Copula tte nani?! - Whats a copula?
Copula = is/am = Desu/da*
da is just an informal version of desu*
However! look at this:
Desu Desu
Are they the same? 0.o Look hard!
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..................
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No!!!
They aren't the same!
One is the copluar and one isn't!
Confused yet?
^_^
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If: Sentence ends in a noun
Then: Copula! desu/da
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If : Sentence ends in an adjective
But "desu" can be added to make the sentence polite, However this "desu" is not the copula! Remember above? They look alike.. but they aren't the same.. Here the Desu is optional, to be polite, BUT above in the pink, it is NEEDED!
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What about verbs you ask? What about verbs? lol.
When ending in a verb.. The verb is a copular in it's self,
so NO desu/da is needed or aloud. XXXXX
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What? Now you want examples?!
ok...
Noun: Sore ha inu desu - That is a dog
(The desu is needed... It's the copula)
Noun: Kore ha neko da - This is a cat
(The da is needed... It's the copula)
Adjective: Hana ha kirei desu - The flower is pretty
(Desu makes it formal, however it is not needed)
*[Adjective: sora ha aoi da - The sky is blue]*
*(WRONG! - da can't be used! NO NO!!)*
Verb: Uchi ni kaerimasu- (I'm) returning home
(NO desu/da, It's a copular in itself)
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Final words on Copula
Simple word order
English word order: I love you
Subject - object - verb
Japanese word order: I you love
Prefix: O and Go
Go is for words that originated in
ex. Oname-name
Osushi-sushi
Osake - rice wine
Ohashi-chopsticks
Okusuri- medicine
Oyasumi- rest
Okane-money
Oisogashii -busy
ex. GOissho- With
GOshokai- introduction
GObuji- safe, unhamed
GOkozoku -family