Learn Russian: Мой брат избегает темноты и боится призраков. - My brother avoids darkness and fears ghosts.

In Russian, verbs expressing fear, avoidance, or desire usually require their object to be in the Genitive case rather than the Accusative. Both избегать (to avoid) and бояться (to fear) follow this rule, which is why we see the Genitive forms темноты and призраков instead of direct objects.

What are the dictionary forms of темноты and призраков, and how are their Genitive endings formed?

The dictionary (Nominative) forms are темнота (darkness, feminine singular) and призрак (ghost, masculine singular). To form the Genitive singular, the feminine -а changes to -ы (темноты). For the Genitive plural, a masculine noun ending in a hard consonant like призрак adds -ов (призраков).

Why does боится end in the reflexive particle -ся if the brother isn't scaring himself?

While -ся often shows that an action is done to oneself, it is also permanently attached to many verbs of emotion, state of being, or interaction. Бояться (to fear / to be afraid) is a classic example. It always keeps the -ся (or -сь) ending, even though the fear is directed outward at something else.

Does the verb избегает have the word "run" hidden inside it?