21.8 should 和ought to

21.8   should 和ought to

除了上述的用法，两者还可表示"想必一定，按理应该"的意思。例如：

I ought to be able to live on my salary. 靠我的薪水，想必也能维持了。

It ought to be ready now. 想必现在准备好了吧。

They should be there by now, I think. 现在他们该到那儿了。

The poems should be out in a month at most. 诗集估计最多还有一个月就要出版了。