1·The past participle of regular verbs ends in '-ed'.
规则动词的过去分词以-ed结尾。
—— 《牛津词典》
2·Teacher: "John, what is the past participle of the verb to ring?"
老师：“John，动词ring的过去分词是什么？”
3·She studied fifteen verbs about their past tense and past participle this afternoon.
今天下午，她学习了十五个动词以及它们的过去式和过去分词。
4·In English grammar the gerund have exactly the same form as the present participle.
英语文法中，动名词具有与现在分词完全一样的形式。
5·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。