Components
ことがある is an exact match with one form of the following word:
ことがある
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1. (something) has occurred; to have done (something); such a thing happened  (after the past tense form of a verb; often written with kana only)
2. (something) happens on occasions; there are times when  (often written with kana only)
My mastery:
My current mastery of ことがある:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 2 (among the 1,500 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 143,483 which gives a rank of 1,577
ことがある is the most useful form. 1 additional form is shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 90% of the time
• Google Japan frequency rank: 600 (about 1,400,000,000 results)
• Routledge most useful 5000 words rank: 775
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Example sentences:
ゆうびんきょく
郵便局
よることがあるから
てがみ
手紙
してあげる

I go via the post office sometimes, so I'll post your letter for you.
いま
まで
かれ
あったことがあります
Have you ever seen him?
この
ものがたり
物語
んだ
ことがありません
I haven’t read this story before.
事がある
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Reading : ことがある   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 5,000 (about 176,000,000 results)
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ジ   ズ   こと thing; matter   
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