go back to do something意思是,回去,（然后）做什么什么；
go back to doing something意思是本来在做某事,被打断后,回去继续做刚才做的事. 两种用法都存在的。
例句：
If you are not happy about a repair, go back and complain.
如果你对修理不满意，就回去投诉。
Everyone thought I was crazy to go back, but I wouldn't be moved.
人人都认为我回去是疯了，可我是不会动摇的。
Of course we want to go back some day—it's our country, our real home.
我们当然希望有一天能回去—那是我们的祖国，我们真正的家。
温馨提示：
