Grammar Lesson 5 : SHOWING DIRECT CONTRAST: WHILE AND WHEREAS

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I want to put another post about the Adverb Clauses. I need your idea about what you think. Are these posts are helpful? Do you like these posts about grammar lesson and need more or not?

SHOWING DIRECT CONTRAST: WHILE AND WHEREAS
(a)     Mary is rich, while John is poor.  (b)     John is poor, while Mary is rich. (c)     Mary is rich, whereas John is poor. (d)     Whereas Mary is rich, John is poor.	While and whereas are used to show direct contrast: “this” is exactly the opposite of “that” While and whereas may be used with the idea of either clause with no difference in meaning. Whereas mostly occurs in formal written English.  Note: A comma is usually used even if the adverb clause comes second.
COMPARE  (e)    While I was studying, the phone rang	While is also used in time clauses and means “during the time ”