Although argumentative writing does not emphasize the necessity of using sub-arguments, it is easy to explain the problem thoroughly after using sub-arguments.

There are two kinds of arrangement of sub-arguments: horizontal and vertical.

The horizontal argument is mainly carried out from space, and what happened in different places is written together to make the discussion more thorough.

The vertical argument is mainly carried out in time, and everything from ancient times to the present is written together to improve the thoroughness of the discussion.