leave sb doing sth让某人一直做某事，宾语与宾补之间是逻辑上的主动关系，表进行。

it is wrong of you to leave the machine running.leave sth to be done留下某事要做，不定式表将来。

We hurriedly ended our meeting,leaving many problems to be settled.leave sb to do sth 留下某人做某事，不定式表将来。

He lift,leaving me to do all the rest work.leave sth undone留下某事未做，宾语与宾补之间是逻辑上的被动关系，表被动和完成。

The guests left most of the dishes untouched,because they did not taste delicious.