No. 8 in Japanese
だ
"だ" is the casual copula in Japanese, meaning "is" or "to be."
In a sentence
彼は学生だ。
He is a student.
Here, 'だ' is used as the plain form of the copula, stating the identity or nature of the subject.
今日はいい天気だ。
Today is nice weather.
This usage of 'だ' indicates a direct and plain-form statement about the current condition.
彼女は医者だと言った。
She said that she is a doctor.
Here, 'だ' functions within a subordinate clause as part of reported speech, maintaining the copula in its plain form.
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