(1) go on to do sth. 表示“接着做另一件事”,即接下去做与原来不同的一件事;
(2) go on doing sth.表示“继续不停地做某事或间断后继续做原来没有做完的事”;
After they had read the text, the students went on to do the exercises.
读完课文后,学生们继续做练习。
The students went on talking and laughing all the way
一路上学生们一直有说有笑。
一个是将来要去做的,另一个是正要去做的。