All the efforts指所有努力,努力没有特指什么努力,不用加of,也是约定俗成的
all of the efforts后面一般加定语从句修饰efforts
Considering all of the efforts to tweak the law and then tweak it again, you have to wonder about the value ofthe medical expense deduction: is time for it to go
如果讲的是发生在过去的一件事 当然可以用一般过去式
但是用all就好 不要改成all of
all efforts= all of the efforts 习惯上用这两种说法