Structure
Verb + とされている
[い]Adjective + とされている
[な]Adjective + (だ) + とされている
Noun + (だ) + とされている
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Standard
About とされている
とされている is an expression that is commonly translated as 'to be considered as (A)', or 'to be regarded as (A)'. Conceptually, it is similar to にする, which means 'to decide on (A)'. However, due to する being in the passive form in this construction, it is closer to 'to be decided on', and expresses the general opinions/thoughts of large groups of people.
The と in this expression is a case marking particle, and expresses the result nuance of this particle.
Caution
The main difference between と as a case marking particle and と as a conjunction particle is that the case-marking particle will always link a single word/phrase to one specific word/result. The conjunction particle on the other hand, will often be followed by a 読点 (Japanese comma), as it is separating two distinct thoughts within the sentence, rather than just a simple 'result'.
Examples
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論文:「WP40は使用が多いとされている。」
Essay/article: 'WP 40 is (generally) considered to have many applications.'
論文:「ポーランド人には13という数字は不吉な数字とされている。」
Essay/article: 'The number 13 is considered unlucky by the Polish.'
論説:「ジム・モリソンの正確な死因は不明とされているのである。」
Dissertation: 'The exact cause of Jim Morrison's death is (widely) regarded to be unknown.'
論説:「歴史的に平仮名は元は『女のもの』だとされていた。」
Dissertation: 'Historically, hiragana was originally (widely) considered 'a woman's thing.''
論説:「過度のアルコール飲料の摂取は多数の病気の原因になるとされている。」
Dissertation: 'It is (generally) accepted that excessive consumption of alcohol causes numerous diseases.'
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JLPT先生
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Tobira
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