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I was not sure vs I were not sure

I was not sure vs I were not sure which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I was not sure is the most popular phrase on the web.

I were not sure

165 results on the web

I was not sure

1184,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

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I was not sure vs I were not sure | GrammarChecker.io