Direct speech: the reporting of speech by repeating the actual words of a speaker for example "I'm going" she said. 
Indirect speech: indirect speech is a means of expressing the content of statements without quoting them explicitly as is done in direct speech. 
 
        
             
        
        
        
My brother is writing a story about a soldier in vietnam is in the progressive tense of the verb.
Generally speaking, a verb is a term (part of speech) that denotes an action (bring, read, walk, run, learn), an occurrence (happen, become), or a state of being in grammar. The Latin verbum, which meaning "word," is where the term verb originates (be, exist, stand). The fundamental form used to describe English is the infinitive, with or without the word to. In many languages, verbs are inflected (modified in form) to indicate tense, aspect, mood, and voice. 
Learn more about Verb here:
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Answer: I think it would be: Allow people to do what they want.
Explanation:
The others don't sound correct to me.