Why The Shoulder Length Layered Bob Cut Is The Most Versatile And Trendy Hairstyle For Every Face Shape

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 left.

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

Why The Shoulder Length Layered Bob Cut Is The Most Versatile And Trendy Hairstyle For Every Face Shape 3

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

Why The Shoulder Length Layered Bob Cut Is The Most Versatile And Trendy Hairstyle For Every Face Shape 4

Can you please explain to me the difference in mean

Why The Shoulder Length Layered Bob Cut Is The Most Versatile And Trendy Hairstyle For Every Face Shape 5

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, and i don't.

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 if i replace.