1 They only acted in terms of membership to the extent that they identified with the group.
to the extent that为复合连词，引导程度/结果状语从句。
他们仅以成员的身份采取行动，他们认同这个群体。
2.“Reichert concludes that tyranny does not flourish because offenders are helpless and ignorant ; it flourishes because they are convinced that they are doing something worthy.”
第一分句中为否定句，但not的否定范围包括because从句，即谓语动作的发生不是因为A。第二分句为肯定句，从正面描述该动作的发生是因为B。
