2 . Find and underline the past participles in the sentences below. What function do the past participles have? Answer the questions below.
1. Most people just use the shortened name: “the United Kingdom” or “the UK”.
2. They use the same flag, known as the Union Jack, as well as share the same currency and military defence.
3. They had castles built all around England, and made changes to the legal system.
4. 小结：shortened在句1中位置在名词 ______，known在句2中位置在名词 ______。 1、2句中分词都用来修饰 ______，作定语；句子3中名词castles 是had的宾语，所以built是对名词castles进行补充说明，作_______。

3 . Look at some pictures and appreciate the past participle by answering the functions of it.

1.a broken vase	2.an injured player
3.a bridge built in 1937	4.make themselves heard

1. ________
2. ________
3. ________
4. ________