动名词连接的句子问个有难度的问题 he looked at his watch .he hurried to the s

动名词连接的句子
问个有难度的问题 he looked at his watch .he hurried to the station 书上说这句话可以改写成 after looking at his watch ,he hurried to the station 这里的 looking是什么词性不是现在进行时吧 如果是动名词他在句子中做的什么成分啊,然后书上还说也可以 after having looked at his watch,he hurried to the station 这里having looked 又做什么成分 ? 同样例句可不可以改成 when he looked his watch, he hurried to the station 我这样写应该没错吧这几句话搞糊涂了