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Grammar detail: other forms of です

other forms of です
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In most everyday conversations, です is the form of the verb 'to be' you will encounter at the end of sentences. です is the equivalent of the ます form, ie the normal polite form used in speech, or at the end of written sentences.
The plain form, used in embedded clauses or casual speech, is だ. The past form of だ is だった.
The three other forms you will commonly encounter are である, であります and でございます:
  • である is a more formal version of だ. In other words, it is a plain form, rather than a polite form, but it is more 'official' sounding. In speech, it might be used by a politician or other senior person in place of です at the end of a sentence. In written Japanese, it would be the typical form in for example a Wikipedia article.
  • であります is the polite form of である. It would be used by a speaker who needs to be both formal (such as when speaking in a formal setting, eg giving a speech, talking to a senior official), and polite (such as when the speaker is addressing someone more senior).
  • でございます is the humble form. Compared to であります, this has the effect of elevating the relative status of the listener (or lowering the relative status of the speaker). Most commonly this might be used by a waiter speaking to a customer. (でございます is the masu form of でござる, an older form which you will still hear in samurai dramas. でござる is formed from で + ござる, which is a politer form of ある.)
Each of these forms may also be encountered with a も after the で (eg, でもある, でもあります). The も carries its usual meaning 'too, also'. This example illustrates several of these forms together:
かれ
せいじか
政治家
であるだけではなく
ちょめい
著名
がか
画家
でもあります
Besides being a statesman, he is a well-known painter.

Negative forms

Several negative forms also exist.
  • ではない is the most common negative form of the plain form だ.
  • でない is sometimes used instead of ではない. The は in ではない actually functions like the particle marker は, which leads to a subtle difference between the two forms.
  • じゃない is increasingly used, especially in colloquial speech, instead of both forms.
  • ではありません is the polite negative form
  • じゃありません is a hybrid 'casual polite form' - casual, but still with the intention of being polite

Volitional forms

The two main volitional forms are:
  • だろう - the plain form
  • でしょう - the polite form

Te form

The て form of です is で, and it is often used as a simple way to join two statements:
それたいへんきたない
しごと
仕事
のだ
It's a hard, dirty job.
Since で is very commonly used as a particle to indicate location etc, be careful not to confuse this form! The simple test is to see if you can replace the で with です and end the sentence there.
A polite て form of です also exists: でして. This is often used as a polite alternative to です at the end of a sentence. Ending a sentence with the て form is a way to 'soften' the sentence.
わたし
しばらく
いんせい
隠棲
していた
ものでして
It is because I was leading a secluded life for a while.
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Kanji used in this grammar

ヒ   かれ he   
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セイ   ショウ   まつりごと government   
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ジ   チ   おさめる to govern   おさまる to be at peace   なお to get better   なお to cure   
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カ   ケ   house   いえ    や    
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チョ   あらわ to publish, write   いちじるしい remarkable   
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メイ   ミョウ   な name   
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ガ   カク   draw
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シ   ジ   つかえる to attend to   
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ジ   ズ   こと thing; matter   
シ   わたくし    わたし I, myself   
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イン   かく to hide, to conceal   かくれる to hide, to be in hiding   
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セイ   す to dwell, to live (animals)   
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