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Declaring something is so and so using 「だ」
One of the trickiest part of Japanese is that there is no verb for the state-of-being like the verb "to be" in English. What Japanese has instead, is
a way to declare that something is the way it is by attaching
when we learn about nouns and adjectives.
Declaring that something is so using 「だ」
（１） 魚。 - Fish.
（２） 魚だ。 - Is fish.
Seems easy enough. Here's the real kicker though.
A state-of-being can be implied without using 「だ」!
As it stands, （１） is simply the word 'fish' and doesn't mean anything beyond that. However, we'll see in the next section that with the
topic particle, we can infer that something is a fish from the context without declaring anything.
So the question that should be floating around in your head is, "If you can say something is [X] without using 「だ」,
then what's the point of even having it around?" Well, the main difference is that a declarative statement makes the sentence sound
more emphatic and forceful in order to make it more... well declarative. Therefore, it is more common to hear men use 「だ」 at the end of sentences.
This is why you cannot use 「だ」 when asking a question because then it sounds like you're making a statement and asking a
question at the same time.
The declarative 「だ」 is also needed in various grammatical structures where a state-of-being must be explicitly declared.
There is also the case where you must not attach it. It's all quite a pain in the butt really but you don't have to worry about it yet.
Conjugating to the negative state-of-being
In Japanese, negative and past tense are all expressed by conjugation. We can conjugate the state-of-being to either its negative or past tense to
say that something is not [X] or that something was [X]. This may be a bit hard to grasp at first but none of these state-of-being conjugations makes
tenses declarative by attaching 「だ」 to the end of the sentence .
First, for the negative tense, one simply attaches 「じゃない」 to the noun or na-adjective.
Conjugation rules for the negative state-of-being
（例） 友達 → 友達じゃない (is not friend)
（１） 魚じゃない。- Is not fish.
（２） 学生じゃない。- Is not student.
（３） 静かじゃない。- Is not quiet.
Conjugating for the past state-of-being
We will now learn the past tense of the state-of-being. To say something was something, 「だった」 is attached to the noun or na-adjective.
The negative can be changed to the negative past tense by simply dropping the 「い」 from 「じゃない」 and adding 「かった」.
Conjugation rules for the past state-of-being （例） 友達 → 友達だった (was friend)
「じゃない」 with 「かった」
（例） 友達 → 友達じゃない
→ 友達じゃなかった (was not friend)
（１） 魚だった。- Was fish.
（２） 学生じゃなかった。- Was not student.
（３） 静かじゃなかった。- Was not quiet.
To sum up
We've now learned how to use express a state-of-being in all four tenses. Next we will learn some particles, which will allow us to create relationships between two
nouns. Here is a summary chart of the conjugations we learned in this section.
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