1

Consider:

Table 1 shows the number of rules required to extract the main article for each website.

vs.

Table 1 shows the number of rules required to extract the main article from each website.

From is the common preposition for "extract", while for is also meaningful as we can say it shows X for each Y. Then sometimes I don't know which is better to be used!

Other examples:

Moreover, removing distracting parts from/on a web page can enhance the page readability

For a simpler task such as extracting the main articles from/on/in/of a news website, the features they provide can be excessive.

  • I am working on prepositions, However, I've concluded that the best rule is using the correct collocation. I use Oxford dictionary which clearly determines what preposition should be used. If I want to write a sentence, I use the pattern " extract sth from sth " as it declared in Oxford. – Cardinal Aug 25 '15 at 18:36
  • @Cardinal yes "from" is for extract but "for" is also for "show", here they give different structures to the sentence, that's my main confusion – Ahmad Aug 25 '15 at 18:42
  • In that case you might want to add a comma after 'article'. – Victor Bazarov Aug 25 '15 at 18:45
  • I am confused. As I see, you want to extract sth from each website ? don you ? or you want to show sth for each website ? What is your intent ? or what is the intents behind the table. 1 – Cardinal Aug 25 '15 at 18:46
  • @Cardinal the template is Table 1 shows the number of rules (...) for each website – Ahmad Aug 25 '15 at 18:49
1

From is the correct preposition for extract.

However, the first sentence can still be considered correct if "for" is associated with "required. In that case, the sentence is correct but could be improved with the order:

Table 1 shows the number of rules required for each website to extract the main article. (This has a different meaning, which could be wrong in your context)

The verb "extract" has to have an object, but a prepositional phrase is not strictly required. All the examples you provide have a preposition that can function as a modifier of something else in the sentence.

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