Final answer:
Carlos and Kiki don't talk to Nenny and Esperanza outside because they are shy.
Step-by-step explanation:
Carlos and Kiki don't talk to Nenny and Esperanza outside because they are shy. In the book 'The House on Mango Street' by Sandra Cisneros, Carlos and Kiki are described as being very shy and reserved. They may feel uncomfortable or anxious about talking to Nenny and Esperanza outside, so they choose not to engage in conversation.