Final answer:
August tells the school nurse that they have to leave early to catch the last boat, missing out on interesting things.
Step-by-step explanation:
August tells the school nurse that they always have to leave early in order to catch the last boat, just when things are becoming interesting. This information is mentioned in the passage: "Sure, sure," said McTeague. "August too-everybody," he added, vaguely. "We always have to leave so early," complained Trina, "in order to catch the last boat. Just when it's becoming interesting."