简单的英语：请把以下4句话用分词改写.谢谢

改为：1.HAving thought he could sell the jar and getting some money for it,he immediately opened it.要点：当主句和从句的主语指同一人或同一事物的时候,从句中的谓语动词就可以用分词.分词有现在分词和过去分词,表示主动的用现在分词,表示被动的用过去分词,分词在时间上有一般式和完成式,与谓语动词同时发生用一般式（doing）,发生在谓语动词之前用完成式（having done).
2.The boy rushed out ,almost knocking me down.要点同上
3.Being interested in geography,I I find it quite easy to learn it well.要点同上
4.I heard someone calling my name.此句本身就是现在分在分词作宾语补足语,hear sb.doing.不需要再改.

1.Having thought he could sell the jar and get some money for it,he immediately opened it.
2.The boy rushed out , almost knocking me down.
3.I'm very interested in geography,finding it quite easy to learn it well.
4.I heard someone to have called my name.
弄清楚分词在句中充当什么成分就行

什么叫用分词改写? 要改成什么分词?
请写清楚一点问题