ought to 的用法

1. 表示 “应该”, “应当”。
You ought to visit your parents more often. 你应该多点去看你父母。
You ought not to take his book without informing him. 你不应该未经同意就拿他的书。
What ought I to say to him? 我应该和他说些什么呢？

3. 表示揣测
The water ought to have boiled by now. 现在水应该开了。
We ought to be hearing from Mary soon. 我们应该很快就能收到玛丽的信。