I cannot find the edit part. The first post is missing.
"The full stop (.) is used when we wish to show that the idea concerned is the sentence is complete."
Why is it incorrect that if we write "The full stop is used when we wish to show that related idea in the sentence is complete." , i.e, why can't we use "related idea" instead of "idea concerned" ?
Because I am not good at English so I would like to ask that whether or not we can use "related" as an adjective such as in this sentence: "Related book has strange formulas."