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1. This occurs when an individual learns to do things that produce rewards in his environment and learns not to do things that produce punishments.
【结构分析】句子主干为：This occurs;“when an individual … not to do things that produce punishments”为when引导的时间状语，其中“that produce rewards in his environment”和“that produce punishments”为that引导的从句来分别充当两个things的后置定语。
2. The study involves 20 people who started combinations of anti-HIV drugs very early in the course of the disease, within 90 days of their infections.
【结构分析】句子主干为：The study involves 20 people;“who started combinations of anti-HIV drugs very early in the course of the disease”为who引导的从句来充当“people”的后置定语;“within 90 days of their infections”对“very early in the course of the disease”进行补充说明。
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