They both describe an ongoing or continuous action.

它们都描述的是正在进行的或连续的动作。

A written plan that is expressed in continuous action.

用持续的行动来表达个人的书面计划。

For example, many native users of English use " when" with continuous action.

例如，许多英语母语人士把when和连续动作连用。

The perfect progressive aspect is a combination, describing a completed part of a continuous action.

完成进行时则是上述两者的结合，描述一个持续动作中完成的部分。

A past continuous action like it was raining informs the state of a second action.

过去的连续动作，比如下雨，表明了第二个动作的状态。

You can use actions with the questions with the verb " be" , but they can only be continuous actions.

带动词“be”的疑问句可以使用动作，但只能是连续的动作。

If it is correct, how can we understand the following rule: As a general rule, you should use " while" in a clause with a continuous action, using a verb in a continuous tense.

如果正确，那该如何理解下面的规则：作为一般规则，while在从句中表示连续的动作，动词要用进行时态。

When you are talking about a continuous action that begins in the past and continues until the present, as our speaker does in talking about the dragon, you combine has with been and the -ing form of the verb.

当你谈论从过去开始一直持续到现在的连续动作时，就像我们的演讲者在谈论龙时所做的那样，你将 has 与 been 和动词的 -ing 形式结合起来。

They could be a gerund, as you know, so they're nouns; they could be part of the continuous verb, so " be going" , so: " I am going" , it's a continuous action; but " ing" words can also be adjectives and adverbs.

如您所知，它们可以是动名词， 所以它们是名词； 它们可以是连续动词的一部分， 所以“be going”，所以：“I am going” ，这是一个连续动作； 但“ing” 词也可以是形容词和副词。