Two good things that body paragraphs should contain is evidence/cite/quote and an answer to the original question or topic. <span />
The authors purpose is the answer that you want.
The present progressive tense is created by combining the present participle of the primary verb with the present tense of the verb be.
It can also be used to discuss an action that will take place in the future or that is taking place concurrently with another action. It is created by combining the present participle of the primary verb with the present tense form of the verb to be.
An action that is currently taking place is described using the present progressive. "I am reading right now," for instance. Observe how this construction differs from the present simple (I read), present perfect (I have read), and present perfect progressive (I have read) ("I have been reading").
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