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Grammar detail: ことがある

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JLPT:
ことがある - there are times when, there are times that
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description
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ことがある
means
there are times when~
, or simply
sometimes~
こうじょう
工場
はいきぶつ
廃棄物
わたしたち
私達
かわ
けが
ことある
Factory waste sometimes pollutes our rivers.
ふたご
双子
くべつ
区別
むずか
しい
ことある
It is sometimes difficult to tell twins apart.
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See also:
  • verb plain past + ことがあります - having done

Kanji used in this grammar

コウ   ク    work   
2
ジョウ   ば place   
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2
ハイ   fall into disuse   すたれる to fall into disuse, become obsolete   すた to be disgraced   
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5
キ    abandon   
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5
ブツ   モツ   もの thing   
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2
シ   わたくし    わたし I, myself   
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2
タツ    arrive   
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3
セン   かわ river   
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1
オ   きたな dirty   けが to defile, stain   けがれる to be defiled   けがらわしい dirty, defiled   よご to make dirty   よごれる to be dirty   
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4
ソウ   ふた pair   
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4
シ   ス   こ child   
1
ク    ward   
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4
ベツ   separated   わかれる to be separated   
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2
ナン   むずかしい difficult   かた hard   
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3
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