SENTENCE EXPLANATIONS1. It also teaches young people how to prevent Aids, and sets up treatment centres where mothers with HIV can receive medicine to help keep them from passing HIV on to their children. (P35)【分析】这是一个复合句。在该句中，how to prevent Aids 是主句谓语 teaches 的直接宾语； where mothers with HIV can receive medicine to help keep them from passing HIV on to their children 是限制性定语从句，修饰 treatment centres。【句意】 它（这个组织）也教导年轻人如何预防艾滋病，并建立治疗中心，让携带艾滋病病毒的母亲们得到药物，有助于防止她们把病毒传给孩子。2. Their grandfather is now caring for them, and because their mother had access to prescription Aids medicines when she was pregnant, they did not get HIV from her. (P35)【分析】 这是一个由 and 连接的并列复合句。第一个分句是个简单句。在第二个分句中，because ... she was pregnant 是原因状语从句，其中，when she was pregnant 是时间状语从句；they did not get HIV from her 是主句。【句意】 他们的爷爷现在在照料他们，而且由于他们的妈妈在怀孕期间使用了处方艾滋病药物，他们没有从她那里感染到艾滋病病毒。
