Why Weather Wunderground Com Is The Preferred Choice For Real Time Storm Tracking And Precise Neighborhood Temperature Reports

I have flunked the exam, that is why i am attending coaching classes.

I have flunked the exam, which is why i am attending coaching classes.

Is there any change in the meaning of sentence.

Why Weather Wunderground Com Is The Preferred Choice For Real Time Storm Tracking And Precise Neighborhood Temperature Reports 3

Why is it that everybody wants to help me whenever i need someone's help?

Why Weather Wunderground Com Is The Preferred Choice For Real Time Storm Tracking And Precise Neighborhood Temperature Reports 4

Why does everybody want to help me whenever i need someone's help?

Why Weather Wunderground Com Is The Preferred Choice For Real Time Storm Tracking And Precise Neighborhood Temperature Reports 5

Can you please explain to me.

Good explanation of why it's optional in this case, although i'm not convinced that reason is the only reasonable antecedent of why.

For example, the explanation why is a common usage,.

Why should the first person pronoun 'i' always be capitalized?

I realize that at one time a lot of nouns in english were capitalized, but i can't understand the pattern of those.