Which one is grammatically correct? “have shown” or “have been shown”? [on hold]

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Here's the sentence:
1) Speed cameras have shown to reduce accidents.
or
2) Speed cameras have been shown to reduce accidents.










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put on hold as off-topic by Hot Licks, JJJ, TrevorD, Lawrence, kiamlaluno Apr 3 at 15:23


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "Please include the research you’ve done, or consider if your question suits our English Language Learners site better. Questions that can be answered using commonly-available references are off-topic." – JJJ, Lawrence

If this question can be reworded to fit the rules in the help center, please edit the question.























    0















    Here's the sentence:
    1) Speed cameras have shown to reduce accidents.
    or
    2) Speed cameras have been shown to reduce accidents.










    share|improve this question













    put on hold as off-topic by Hot Licks, JJJ, TrevorD, Lawrence, kiamlaluno Apr 3 at 15:23


    This question appears to be off-topic. The users who voted to close gave this specific reason:


    • "Please include the research you’ve done, or consider if your question suits our English Language Learners site better. Questions that can be answered using commonly-available references are off-topic." – JJJ, Lawrence

    If this question can be reworded to fit the rules in the help center, please edit the question.



















      0












      0








      0








      Here's the sentence:
      1) Speed cameras have shown to reduce accidents.
      or
      2) Speed cameras have been shown to reduce accidents.










      share|improve this question














      Here's the sentence:
      1) Speed cameras have shown to reduce accidents.
      or
      2) Speed cameras have been shown to reduce accidents.







      grammar






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Mar 30 at 18:27









      tatatata

      1




      1




      put on hold as off-topic by Hot Licks, JJJ, TrevorD, Lawrence, kiamlaluno Apr 3 at 15:23


      This question appears to be off-topic. The users who voted to close gave this specific reason:


      • "Please include the research you’ve done, or consider if your question suits our English Language Learners site better. Questions that can be answered using commonly-available references are off-topic." – JJJ, Lawrence

      If this question can be reworded to fit the rules in the help center, please edit the question.







      put on hold as off-topic by Hot Licks, JJJ, TrevorD, Lawrence, kiamlaluno Apr 3 at 15:23


      This question appears to be off-topic. The users who voted to close gave this specific reason:


      • "Please include the research you’ve done, or consider if your question suits our English Language Learners site better. Questions that can be answered using commonly-available references are off-topic." – JJJ, Lawrence

      If this question can be reworded to fit the rules in the help center, please edit the question.






















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