1、we followed tom,we started to ...，整合，following tom,we...
2、he opened the drawer,he took out a box,整合。。。
3、when they heard the news, they all jumped with joy
4、when he returned home...
老实说，我觉得2也可以用after opening...
所以，语法的这些名次都不用太较真，这些都是中国人归纳的。你就记着现在分词可以这么用就可以了。考试只会考用法。
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