分词的形式 

1.现在分词和过去分词的主要区别 

1）及物动词的现在分词表主动，过去分词表被动 

例句：The news excited the children. 

——> The news was exciting. 

The children were excited. 

2）不及物动词的现在分词表进行，过去分词表完成 

例如：developing country ——> developed country 

2.现在分词的四种形式 

1）一般式 doing 表主动/进行，与谓语动词同时发生，与逻辑主语是主动关系。 

例句：I hear someone singing next door. 

2）被动语态 being done 表被动/进行，与谓语动词同时发生，与逻辑主语是被动关系。 

例句：The problem being discussed is very important. 

3）完成时 having done 表主动/完成，发生在谓语动词之前，与逻辑主语是主动关系。 

例句：Having done his homework, Jim played with his friends.