be of如何理解

题目

be of如何理解
It is of great help to master a foreign language.
可不可以写成 It is very helpful to master a foregin language.
像上面简单的容易看懂.
像这种难点的一时半会儿看不来了
These findings add considerable weight to the claims that emotional arousal is of causal significance to relapse.
是不是可以改成 .that emotional arousal is a significant causal to relapse.
这个be

答案

规律：be of + 抽象类名词 = be + 该抽象类名词所对应的形容词延伸：be of + 形容词 + 抽象类名词 = be + 形容词对应的副词 + 该抽象类名词所对应的形容词 所以第二句的正确改法为：that emotional arousal is causa...