Answers: "You yourself should try to understand the lesson." and "Before running the marathon, Tom himself ate three plates of pasta."
Explanation: Intensive pronouns are often used to add emphasis to the subject of the sentence, so the answers would be the two sentences above. The reflexive pronouns include myself, yourself, himself, herself, themselves, etc.
To make a more personal and intimate appeal directly to another person
Science is used in millions of ways everyday, just like how it formed the world we currently live in and can for the future.
