now then vs why

now then

• A mild admonishment. 

• A greeting. 

• Used to move or return to another subject of discussion. 

why

• An exclamation used to express pleasant or unpleasant mild surprise, indignation, or impatience. 

• Reason. 

• For which cause, reason, or purpose. 

• The cause, reason, or purpose for which. 

• Introducing a noun or other phrase. 

• Introducing a verb phrase (bare infinitive clause). 

• Introducing a complete question. 

• With a negative, used rhetorically to make a suggestion.