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返回课程 ASD-STE100（简化技术英语）规则部分Rule 3.3 Use the past participle only as an adjective. 规则3.3过去分词只能用作形容词。
You can use the past participle of a verb as an adjective, as follows:
- Before a noun 

- After a form of the verb “to be” or “to become”. 


When you use the past participle as an adjective, it describes the condition of something. This is not passive voice.


Do not use the past participle if it is not in the dictionary. The past participle is not permitted for some irregular verbs, for example, “been”, the past participle of “to be”. The participle “been” is never an adjective. It is always part of a complex verb form.

Examples in STE:
Connect the disconnected wires.

(“Disconnected” is an adjective before the noun “wires”.)

The wires are disconnected.

(“Disconnected” is an adjective after the verb “to be” that shows the condition of the wires.)

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