We have not observed it. vs We did not observ it.

Both phrases are correct, but they are used in different contexts. 'We have not observed it' is used when referring to a situation that started in the past and continues up to the present. 'We did not observe it' is used when referring to a specific point in the past with no connection to the present.

Last updated: March 19, 2024

We have not observed it.

This phrase is correct and commonly used when referring to a situation that started in the past and continues up to the present.

This phrase is used to indicate that the action of not observing something started in the past and is still relevant in the present.

Examples:

We have not observed any changes in the patient's condition.
They have not observed any improvement in the project's progress.

Show examples from the web [+]

possibilities for the existence of life or why we have not observed it as of yet, since none of these approaches have been successful. It may now be possible to ...
Oct 29, 2015 ... "There is no need for undue alarm because we are on a course to recovery, but we have not observed it yet," said WMO scientist Geir Braathen, ...
... some other form of existential meaning, does not exist after death because we have not observed it (we discuss this limitation in some detail in our other book).
2 days ago ... I see what he wanted to assert. But why do we need the cat to be dead and alive? As long as we have not observed it, it could be dead OR alive ...

Alternatives:

We haven't observed it.
We've not observed it.
We've not seen it.
We've not noticed it.
We've not detected it.

We did not observ it.

This phrase is correct and commonly used when referring to a specific point in the past with no connection to the present.

This phrase is used to indicate that the action of not observing something occurred at a specific point in the past.

Examples:

We did not observe any unusual behavior during the experiment.
They did not observe the warning signs in time.

Alternatives:

We didn't observe it.
We did not see it.
We did not notice it.
We did not detect it.
We failed to observe it.

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We have not observed it. vs We did not observ it.