haven't observed vs didn't observe

Both "haven't observed" and "didn't observe" are correct, but they are used in different contexts. "Haven't observed" is used when referring to something that has not been seen up to the present moment, while "didn't observe" is used when talking about a specific past event or time period.

Last updated: March 26, 2024

haven't observed

This phrase is correct and commonly used in English.

This phrase is used to indicate that something has not been seen or noticed up to the present moment.

Examples:

I haven't observed any changes in his behavior recently.
We haven't observed any improvement in the situation so far.

Show examples from the web [+]

As of right now, we haven't observed any action taken by the North.
Haven't you observed she can't stand me, your Giulia?
Until Miss Herman observed this and intervened.
I have been observed by Americans before.
My scouts also observed another Confessor on the hill.
Adverse events observed included granulocytopenia, dizziness and paraesthesia.
No incompatibilities have been observed between Zevalin and infusion sets.
Events associated with withdrawal syndrome have been observed outside the therapeutic range.
In rabbits, slight foetotoxicity was observed.
No difference between groups regarding immunogenicity was observed in either study.
Occurrence of injection site hypertrophies has been observed, including lipohypertrophy.
No WHO Grade 4 toxicities were observed.
No dose-limiting toxicity was observed during clinical trials.
No time-dependency of the Pharmacokinetics was observed.
No further clinically relevant accumulation was observed.
No ribavirin effects were observed regarding neurobehavioural or reproductive development.
In reproduction toxicity studies decreased fertility in male rats was observed.
Rebound hypertension has not been observed.
In animal reproductive studies, no teratogenic effect was observed.
No evidence of photosensitivity was observed in rats following administration of tigecycline.

Alternatives:

haven't seen
haven't noticed
haven't witnessed
haven't detected
haven't perceived

didn't observe

This phrase is correct and commonly used in English.

This phrase is used to talk about a specific past event or time period when something was not seen or noticed.

Examples:

I didn't observe any unusual behavior during the meeting.
She didn't observe any changes in the environment after the storm.

Alternatives:

didn't see
didn't notice
didn't witness
didn't detect
didn't perceive

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haven't observed vs didn't observe

haven't observed

didn't observe

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