i heard his sister singing first ,and then laughing

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i heard his sister singing first ,and then laughing
在这里singing是什么词性?我认为是动名词,应为first在这里做副词放在其之后,而现在分词相当于一个形容词或副词,副词修饰副词和形容词,被修饰词应该搁在后面,而副词应放在前面,所以,我认为singing是个动名词.顺便再说一下 laughing是什么词性?thank you

在hear后面的动词都是ing形式的,and then是连接两个先后发生的动作的连接词,laugh就跟sing一样,要变ing形式

i heard his sister singing first ,and then laughing I distantly heard sam laughing.Then his laughing stopped wit His sister likes singing and she is singing t____ I heard she was singing in the next room then.(同义词) I__ her when I walk p__ his room,I heard him singing.填什么 I heard him singing when I pass his room.改被动（主语为he） their work （finished）,they went home singing and laughing. 1,I hear… His sister likes singing（合一句） I hear ___ At first,it was quiet.Then I heard the _of a fire engine.A,s I heard him singing there改被动句是heard singing还是heard to sing I heard him singing改为被动语态 His sister left home in 1998,and has not been heard of since