1、1 keep on +doing: Let's keep on doing our work after an hour's rest.
2、2 keep on +n:If you keep on collection, in time you'll have a wealth of data.
3、3 keep on with +n./ pron.(名词/代词)继续:Let's keep on with our work after an hour's rest.
4、4 keep on +从句：Keep on until you get to the church.