不规则动词是一种特殊的动词，它们在变成过去式和过去分词时不遵循一般的规则。也就是说，它们不是简单地在动词后面加上-ed，而是有自己的变化方式。不规则动词是指在过去式和过去分词中不遵循规则的动词，即不是在动词后面加-ed的动词。例如，walk是一个规则动词，因为你可以说：I walk to school every day. (现在时)I walked to school yesterday. (过去时)I have walked to school many times. (过去分词)然而，go是一个不规则动词，因为你不能说：

I go to the park every day. (现在时)I goed to the park yesterday. (过去时) [错误]I have goed to the park many times. (过去分词) [错误]相反，你必须说：I go to the park every day. (现在时)I went to the park yesterday. (过去时)I have gone to the park many times. (过去分词)

英语中有很多不规则动词，它们可以根据变化的模式分为不同的组。以下是一些最常见的组和每组的一些例子：过去式和过去分词完全不变的动词。例如：cut, hit, put, read, set, shut, spread.He cuts his hair every month. (现在时)He cut his hair last month. (过去时)He has cut his hair many times. (过去分词)

过去式和过去分词只改变一个元音的动词。例如：bring, drink, sing, swim, ring, run.She brings me flowers every week. (现在时)She brought me flowers last week. (过去时)She has brought me flowers many times. (过去分词)过去式和过去分词改变两个元音的动词。例如：begin, break, choose, speak, steal, write.They begin their classes at 9 a.m. (现在时)They began their classes at 8 a.m. yesterday. (过去时)They have begun their classes earlier this week. (过去分词)

过去分词加-n或-en，并且有时在过去式中也改变一个元音的动词。例如：beat, bite, drive, eat, fall, give, see.He beats his drum every night. (现在时)He beat his drum last night. (过去时)He has beaten his drum many times. (过去分词)

过去式和过去分词有不同的形式，并且有时在两种形式中都改变一个元音的动词。例如：come, do, go, know, take.I come from China. (现在时)I came from China last year. (过去时)I have come from China recently. (过去分词)这些只是英语中不规则动词的一些组。还有一些动词不属于任何组，有自己独特的形式。例如：be, have, do.

希望这些能帮助你更好地理解不规则动词，并提高你的英语水平。如果你对英语语法或词汇有任何其他问题，随时可以留言。