だ

auxiliary verb★Beginner

informal

A plain copula used in casual speech to indicate a state or identity, equivalent to 'is' or 'am' in English.

これは本だ。

This is a book.

私は学生だ。

I am a student.

💡

Used in plain/casual speech. The polite form is 'です'.

Collocations

だと思いますI thinkだねisn't it?だもんbecause I am

だねphrase

isn't it?

だもんphrase

because I am

Use 'だ' only with close friends or family. In formal settings, always use 'です'.

In casual speech, sentences often end with 'だ' to indicate a statement.

Derived from the classical Japanese copula 'なり' (nari), simplified in modern casual speech.

Only used in casual speech. In formal contexts, 'です' is used instead. Often contracted to 'っだ' (dda) in rapid speech.

だ

is/am

copula

和英辞典