You’re not gonna get 38 paragraphs man....
The correct sentence with appropriate usage of verbs is:
They had roamed the earth for more than a hundred million years before they became extinct.
The above sentence is correct because the sentence makes the appropriate usage of past perfect tense, past perfect tense refers to the actions which have begun in the past and finished in the past itself when another action happened.
It is formed by, <em>had + past form of the verb</em>
In the above sentence, the first action that <em>“they roamed the earth” </em>is finished by the second act of becoming extinct. Hence it uses two actions in the past therefore, it used the correct form of the verb tense.
You're being morally modified
Pap demands that Huck give him all his money, but Huck tells him that he only has a dollar. Pap makes him give him the dollar. Pap also demands that Huck stop going to school. ... He says he doesn't believe the law should split up families, so he refuses to give the Widow official custody of Huck.
I want to watch the games again<u><em>,</em></u> because they were so inspiring