在考虑记忆的进化及其所有可能的方面时，思考一下如果记忆不会消失会产生什么结果是很有用处的。 【析句】本句的主干是it is helpful to do sth.，真正的主语是to consider这个不定式，当然它里面还包含了一个带条件从句的宾语从句。逗号前面的是一个状语。
In thinking about the evolution of memory together with all its possible aspects, it is helpful to consider what would happen if memories failed to fade.
目前，研究人员猜测梦是大脑情感自动调节系统的组成部分，当大脑处于“掉线”状态时对情绪进行调整。 【析句】Suspect后面是that引导的宾语从句；逗号之后的现在分词短语regulating moods…作定语，解释thermostat 的意思，句末的while引导一个时间状语从句。
Now researchers suspect that dreams are part of the mind's emotional thermostat, regulating moods while the brain is “off-line”.
分析：主语：Americans；谓语：say；that引导一个宾语从句，还包含有一个省略了关联代词的定语从句，a person can be sure in life修饰two things. 当先行词在定语从句中作宾语时，常可省略。
Americans often say that there are only two things a person can be sure of in life: death and taxes.(*)
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