短语讲解：

1. In fact, you can learn how to use two parts of speech: participles and participial phrases.

in fact 事实上; 实际上
例句：You have to admit that you are, in fact, in difficulties
你不得不承认，你事实上是陷入了困境。

2. In general, you can change a relative clause to a participial phrase by removing the relative pronoun and the verb BE.

in general 通常; 大体上; 一般而言
例句：I think we need to improve our educational system in general
我认为有必要从整体上改进我们的教育体系。