Joseph helps at the zoo when he's not at school.

The text states: "At the zoo, Joseph helps to feed the animals and clean out their cages." This implies he works at the zoo, but does not explicitly state it's only when he's not at school. However, the following sentence implies his motivation and desires related to the zoo are aspirational, not necessarily tied to his current schedule. Without explicit confirmation of the timing of his help, this statement is likely false as it imposes a condition not present in the text.

B False