VOA慢速英语:Everyday Grammar: You Had Better Learn Modals!

1. There are about 17 modals in English—grammar experts do not agree on an exact number.

agree on 对某事[物]有同样看法， 商定[同意]某事， 商定做某事
例句：They agree on these terms.
他们一致同意这些条款。

2. For example, "I should have brought my wallet."

for example 例如， 譬如
例句：For example, after an e-mail message has been sent, there is no undoing it.
例如，电子邮件发送以后就不存在撤销了。

3. The next modal we will talk about is ought to.

be ought to 应该是
例句：It ought to be ready by this time.
到这个时候就应当准备好了。

4. In other words, if you don't finish the report, you are in trouble.

in other words 换句话说; 就是说
例句：In other words it has a large automorphism group.
换言之，它有大的自同构群。
in trouble 处于不幸中
例句：I didn't think to land myself in trouble.
我没想到会使自己陷入困境。