on nights/ in the night/ at night

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Hello everyone,

1. On nights, my girl friend puts the keys in the toilet tank.
2. My girl friend puts the keys in the toilet tank in the night.
3. My girl friend puts the keys in the toilet tank at night.

1. She has a mental problem.
2. She has an extraordinay disposition.
3. Am I a car thief?

Do I understand correctly?

Many thanks
 
  • pob14

    Senior Member
    American English
    We don't say "on nights" in that context. "In the night" is a somewhat literary way of saying "at night."

    I have no idea what you are trying to say with the latter three sentences.
     
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