在学习英语的过程中，动词的变化形式是一个重要的组成部分。其中，不规则动词的变化尤其需要注意，因为它们并不遵循一般的语法规则。掌握这些不规则动词的变化规律，对于提高语言表达能力至关重要。

以下是一些常见的英语不规则动词及其过去式和过去分词的例子：

1. begin - began - begun

- 例句：I began my journey yesterday.

- 我昨天开始了我的旅程。

2. break - broke - broken

- 例句：The glass broke when it hit the floor.

- 玻璃杯碰到地板时碎了。

3. choose - chose - chosen

- 例句：She chose the red dress over the blue one.

- 她选择了红色的衣服而不是蓝色的。

4. come - came - come

- 例句：He came to visit us last week.

- 上周他来拜访了我们。

5. do - did - done

- 例句：I did my homework yesterday evening.

- 昨晚我做了作业。

6. eat - ate - eaten

- 例句：We ate dinner together last night.

- 昨晚我们一起吃了晚饭。

7. fall - fell - fallen

- 例句：The leaves fell from the trees in autumn.

- 秋天树叶从树上落下。

8. find - found - found

- 例句：I found my keys under the sofa.

- 我在沙发下面找到了钥匙。

9. go - went - gone

- 例句：They have gone to the park.

- 他们已经去公园了。

10. have - had - had

- 例句：I had breakfast at seven this morning.

- 今天早上七点我吃了早餐。

11. know - knew - known

- 例句：She knew the answer immediately.

- 她立刻知道了答案。

12. leave - left - left

- 例句：He left early this morning.

- 他今天早上很早就离开了。

13. make - made - made

- 例句：She made a cake for her birthday.

- 她为自己的生日做了一个蛋糕。

14. meet - met - met

- 例句：We met at the station yesterday.

- 昨天我们在车站见面了。

15. put - put - put

- 例句：I put the book on the shelf.

- 我把书放在了书架上。

16. see - saw - seen

- 例句：I saw a beautiful sunset yesterday.

- 昨天我看到了美丽的日落。

17. take - took - taken

- 例句：She took a photo of the mountains.

- 她拍了一张山的照片。

18. think - thought - thought

- 例句：I thought about your proposal last night.

- 昨晚我想起了你的提议。

19. understand - understood - understood

- 例句：He didn’t understand the question.

- 他没有理解这个问题。

20. write - wrote - written

- 例句：She wrote a letter to her friend.

- 她给朋友写了一封信。

通过以上例子可以看出，不规则动词的变化形式多种多样，无法简单地通过加“-ed”来形成过去式或过去分词。因此，建议多加练习和记忆，逐步熟悉这些变化模式。掌握这些不规则动词的变化，不仅能提升英语写作和口语的能力，还能帮助更好地理解和使用英语语法。