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。

例句：

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