VOA慢速英语:Everyday Grammar: Can I, Could I, May I?

短语讲解：

1. The teacher was saying the student is able to leave the room, but does not have permission to do so.

be able to 能够
例句：We must be able to stay impartial at all times.
我们必须经常保持公正的态度。

2. May is the most formal way to ask for permission.

ask for 要求
例句：He had the audacity to ask for an increase in salary.
他竟然厚着脸皮要求增加薪水。

3. In other words, you allow the company to save your email address or your computer's address.

in other words 换句话说; 就是说
例句：In other words, the electric energy helps to explain the cohesion of the crystal.
换句话说，电势能有助于解释该晶体的结合力。

4. In addition to expressing permission, may also expresses possibility.

in addition to 除…之外
例句：In addition to light, there are dangerous radiations gi-ven off by the sun.
除了光以外，太阳还发出危险的放射线。