The sentences that use intensive pronouns correctly are "Before running the marathon, Tom himself ate three plates of pasta." and "You yourself should try to understand the lesson".
An intensive pronoun is one that emphasizes the subject of a sentence by referring back to it. Myself, yourself, himself, herself, itself, ourselves, yourselves, themselves are examples of the intensive/reflexive pronouns.
A pronoun that ends in "self" or "selves" and emphasizes its antecedent is referred to as an intensive pronoun.
In the abovementioned sentences intensive pronouns that are "himself" and "yourself" are used correctly.
Thus, the correct options are C and D.
The missing options in the question are:
A. Bela hisself entered the arena on a gray mare.
B. Ime took time to relax this weekend.
C. Before running the marathon, Tom himself ate three plates of pasta.
D. You yourself should try to understand the lesson.
E. Kaitlyn went to the store when she ran out of peanut butter.
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