Question

英语句子的分析？

How well the predictions will be validated by later performance depends upon the amount, reliability, and appropriateness of the information used and on the skill and wisdom with which it is interpreted
为什么主句的谓语动词是depends upon，而不是be，be不是系动词么？

Answer 1

你好，will be validated是从句的谓语动词，depends on才是主句的谓语动词。
这里how well the predictions will be validated by later performances是一个主语从句作主语，"这些预测能被以后的实践证实得怎么样，取决于被使用信息的数量，可靠性和合适性，取决于解读信息的智慧和技巧。

Answer 2

先分清楚主谓宾之后，句子的结构就很清楚的出来啦。