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Research has shown vs Research has showed

Research has shown vs Research has showed 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:

Research has shown is the most popular phrase on the web.

Research has showed

1161,000 results on the web

Research has shown

153,000,000 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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Research has shown vs Research has showed | GrammarChecker.io