Question

Select all of the appropriate purposes for changing pitch. to ask a question to write a short story to end a sentence to give extra meaning to what is said to show emotion to analyze a sentence to show whether you are using a noun or verb to make the meaning of a sentence clear to add variety to our speaking and/or conversations

Answer 1

Changing pitch allows one to:
ask a question (raised pitch at the end)
end a sentence (usually a downward shift of pitch)
to give extra meaning to what is said (by emphasizing certain parts)
to show emotion
to add variety to speaking/conversations

It does not help:
write a short story
to analyze a sentence
to show whether you are using a noun or verb (unless the word happens to have different pronunciations, maybe)
to make the meaning of a sentence clear