The past participle of regular verbs ends in '-ed'.

规则动词的过去分词以-ed结尾。

The past participle used as object complement.

过去分词用作宾语补足语。

Used with past participle to form passive voice.

与过去分词连用，成被动态。

Bought is the past tense and past participle of buy.

买的过去式和过去的购买过去分词。

Give the past and past participle forms of the verbs.

写出动词的过去式和过去分词形式。