We think we should do whatever we can to help our school.该句中

We think we should do whatever we can to help our school.该句中whatever可以换成everything吗?我知道“we should do whatever we can to help our school” 从句做we think的宾语；whatever引导的是名词性从句,那么everything的话可以是定语从句也能解释吧?我觉得句意不会受影响.像这句we should do everything we can to pritect the environment.正确的话,我那句话不可以用everything吗?we should do everything we can to protect the environment.刚才打错单词。我晓得了。因为这是试卷上的填空题，有人说定语从句的话一般只考关系词，不会要求填先行词。确定了我的判断没错就好。Thank you！