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were introduced vs have been introduced

Both "were introduced" and "have been introduced" are correct, but they are different in tense. "Were introduced" is used to talk about a specific time in the past when something was introduced, while "have been introduced" is used to talk about a more recent introduction that has an impact on the present.
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Explained by Vince
Editor at TextRanch

Last updated: September 13, 2024

were introduced

This phrase is correct and commonly used to refer to a specific time in the past when something was introduced.

Use "were introduced" when talking about a specific time in the past when something was introduced. It indicates that the introduction happened at a particular point in time.

Examples:

  • The new product line was introduced last year.
  • The concept of recycling was introduced in the 1970s.
  • In addition to the diseases mentioned above, many species of organisms were introduced to new habitats on the other side of the world accidentally or ...
  • In Alaska, foxes were introduced to many islands to create new populations for the fur trade. About twenty species of African and European dung beetles have ...
  • Jul 19, 2015 ... TIL When trains were introduced in the U.S, many people believed that that “ women's bodies were not designed to go at 50 miles an hour,” and ...
  • Four Standard Time Zones for the Continental U.S. Were Introduced November 18, 1883. Before the U.S. had time zones, how did people traveling across the ...

Alternatives:

  • was introduced
  • had been introduced
  • got introduced
  • was launched
  • was unveiled

have been introduced

This phrase is correct and commonly used to refer to a more recent introduction that has an impact on the present.

Use "have been introduced" when talking about something that was introduced recently and still has relevance or impact on the present. It indicates a connection between the past introduction and the current situation.

Examples:

  • New safety measures have been introduced in the workplace.
  • Several new policies have been introduced to improve customer service.
  • Some species have been introduced intentionally to combat pests. They are called biocontrols and may be regarded as beneficial as an alternative to pesticides ...
  • Up to 26,000 plants have been introduced into New Zealand. This list is a few of the more common and more invasive species. Gorse from Scotland; Common ...
  • Jul 25, 2014 ... I don't know that we have been introduced. Does it mean the same thing as: I don' t think we've been introduced. meaning word-choice ...
  • Aug 3, 2015 ... 364 bills that have been introduced in Congress, ranked by acronym quality. The inside track on Washington politics. Be the first to know about ...

Alternatives:

  • have been implemented
  • have been put in place
  • have been established
  • have been enforced
  • have been enacted

Related Comparisons

it was introduced vs it has been introduced it has been introduces vs it was introduced till vs Till I saw this when vs till till vs untill last vs till

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