Hii so in order to write an essay I needed to find three common themes in both stories of: to kill a mocking bird by harper lee and boys and girls by alice munro.

What I found was: search for ones identity, coming of age but I need one more so I thought of man vs. Woman since in both stories the man is superior to the woman in many ways.

I think you need to re-think the themes you are choosing.

http://www.life123.com/parenting/education/children-reading/12-most-common-themes-in-literature.shtml

http://www.sparknotes.com/lit/mocking/themes.html

http://www.enotes.com/topics/boys-girls/themes

It seems like you have already identified two common themes in both "To Kill a Mockingbird" by Harper Lee and "Boys and Girls" by Alice Munro, which are the search for one's identity and coming of age. However, you are looking for one more theme to analyze in your essay.

To find another common theme between the two stories, you could consider exploring the theme of social injustice or gender roles. Both novels touch upon issues of inequality and discrimination in society.

To find evidence supporting this theme, you can examine specific scenes or events where social injustices or gender roles are portrayed. Look for instances where characters are treated unfairly or limited based on their gender. For example, in "To Kill a Mockingbird," you can examine the trial of Tom Robinson and the sexist expectations placed on Scout to conform to traditional gender roles. In "Boys and Girls," you can analyze the family dynamics and the expectations placed on the protagonist due to her gender.

By analyzing these instances and how they contribute to the overall theme, you can provide a comprehensive understanding of the theme of social injustice or gender roles in both stories. Remember to support your analysis with quotes and examples from the texts to strengthen your arguments.

Additionally, you may want to consider conducting further research on literary criticism or reviews of both novels to gather more ideas and insights on potential themes that may have been explored by scholars or critics in relation to these works.