英语句子语法问题（高一水平）
课本中的一句话 They spend half their time dreaming up wayys of getting rich ,and the rest of their time tinking about about all the enjoyable things they would do once they got rich.
逗号后面and并列的句子动词为什么用ing?（thinking）这样一来后边句子里的动词是什么?
知道的回答一下.先谢过了