Certain changes in North American residential architecture after World War II are attributable mainly to the increase...

Hi, Evidently, there's another place where I can post my questions and get quicker answers. I contacted the service, but they referred me to tutoring and to posting on the message board. Meanwhile, would someone please confirm or correct my understanding of the following terminologies? The conclusion uses the word "mainly." I interpret the word "mainly" to mean either "primarily" or "mostly." To my mind, "mainly," "primarily," and "mostly" are synonymous. Am I correct? Also, am I correct to add to the list of synonyms above the word "usually"? In other words, is true to say that like the words "mainly" and "primarily," the word "usually" also means ""mostly." The following word, "frequently," however, is not the same as "usually"; correct? I think that "frequently" is different than both "usually" and "mostly" because the words "mostly" and "usually" are relative measurements, such as ratios or proportions or percentages, whereas "frequently" refers to an absolute number. Am I correct on this distinction between "frequently"and "usually," the former being absolute whereas the later being relative? Finally, I know that "some" means at least one, but could possibly mean all, and that "most" means 50% plus one. My question is am I correct to distinguish between "some" and "most" on different grounds, on the basis that the former refers to an absolute number, like the word "frequently" (I am not saying that "frequently" means "some"; I am saying they are similar in that they are not measuring relative quantities), whereas "most" is a percentage? Thank You Respectfully, Mazen