I need some help with this because it is quite confusing for me please:

Previous research has shown


Previous research has showed

which one is correct?


1 Answer 1


There are two past participles for "to show"; they are "shown" the usual one, and "showed"; however "showed" is rarely used (OALD.

This ngram shows how rare is "showed". It is so rare that some sources do not list that form (the irreguar verbs).

  • So I should use:
    – Sayed Ali
    Aug 18, 2020 at 9:51
  • So I should use: Past research has shown?
    – Sayed Ali
    Aug 18, 2020 at 9:52
  • @SayedAli That's what I would do; however I wouldn't correct your choice for the time being if you were to use "showed"; I would tell you that there is no obvious reason for chosing "showed".
    – LPH
    Aug 18, 2020 at 10:01
  • many thanks - that is very helpful
    – Sayed Ali
    Aug 18, 2020 at 10:04

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