go on to do　做了一件事后，接着做另一件事。
go on doing　 继续做原来做的事。

• After he had finished his maths，he went on to do his physics.
  做完数学后，他接着去做物理。
• Go on doing the other exercise after you have finished this one.
  作完这个练习后，接着做其他的练习