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Discover Ludwig"had not observed" is correct and usable in written English.
It is the past perfect tense of the verb "observe" and is used to express an action that happened before another action in the past. For example: "He had not observed the warning signs, so he was unaware of the danger ahead."
Exact(45)
He had not observed it himself.
But Oklahoma officials said they had not observed much activity.
The doctors who tried to save her life and conducted a postmortem had not observed any indication of pregnancy.
Corneille, indeed, had not observed the dramatic unities in Le Cid.
Mr. Kay said that he had not observed any harassment of marchers by the police but said that "their presence alone gives everybody a hard time".
Mr. Bergen said he had not observed signs of the virus in the trout or excessive mortality as a result of it.
Similar(15)
It is, in case you hadn't observed, really, really freezing outside.
Scientists hadn't observed such a combination of features in an early Homo fossil until now.
Nor did the story ever mention my question about why the organizers had imposed ground rules they hadn't observed.
Elliott has not observed a big increase in buyers turning away from traditional bridal shops.
"We have not observed yet any of these kinds of games," Dr. Lakhani said.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com