shirabe.org
1)
#16
Common
Meaning
    1. thing; matter
      "What does U.F.O. stand for?" "It means Unidentified Flying Object, I guess."
    2. incident; occurrence; event; something serious; trouble; crisis
      The fat will be in the fire.
    3. circumstances; situation; state of affairs
    4. work; business; affair
      Mind your own business!
    5. after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to
    6. nominalizing suffix
      See also: 事 (こと)
      He was known as a burglar of houses where occupants are present and had a reputation for sneaking in and stealing valuables even during the day.
    7. pretending to ...; playing make-believe ...
      See also: 事 (こと)
    8. alias; also known as; otherwise known as; or
      as AことB (A = alias, B = real name)
    9. necessity; need
      as 〜ことはない
    10. you should ...; I advise that you ...; it's important to ...
      as 〜ことだ
Forms
8)
#254

Inflections of ことになる

Common
Meaning
    1. to have been decided (so) that; to have been arranged (so) that
      usu. sentence ending
      I was allowed to take a week off.
    2. to be the result (of); to be the outcome
      Toil and worry caused his health to break down.
    3. to be the reason (for)
      It follows from what you say that he was not there.
Forms
9)
#285

Inflections of ことがある

Common
Meaning
    1. (for something) to have occurred; to have done (something)
      after the past tense form of a verb
      I have met him before.
    2. (for something) to happen on occasion
      Germs can cause sickness.
Forms
10)
#6,011

Inflections of ことはない

Meaning
    1. there is no need to ...
    2. never happens; there is never a time when
      That will never disappear.
Forms
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