<u>1) Checks for words that are spelled correctly but used incorrectly.</u>
A spell checker is a computer program designed to check the spelling of words in a text, to identify which are misspelled and to provide options to correct them. It is based in spelling, but the program does not take into account the context in which the word is being used, therefore it can not indicate us which word is being used incorrectly.
This writing technique is known as the flashback. It makes the writers back time from the present point of his/ her novel. This writing technique is usually used to remember the past events that occurred in the history. This technique is also used to reveal some essential truth about the main character in the past.
they are considered a frequency adverb. So they are an adverb! :D