Twain uses exaggeration in the boys ambition primarily to

Mark Twain, in his story “The Boys’ Ambition” uses exaggeration primarily to make the story more entertaining.

Exaggeration makes the people captivated to Twain’s story and through the use of this figure of speech, it makes his story to be well known.

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the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.