There are good and bad arguments. These are called conclusion indicators . Each of the five steps in the proof to Euclid's first theorem is an argument. The conclusions in steps 1 to 4 are called intermediate conclusions, while the conclusion in step 5 is the main conclusion. It is not easily articulated, and is not stated in any language.
All planets move on ellipses.
Pluto is a planet. Therefore, Pluto moves on an ellipse. Mercury moves on an ellipse. Venus moves on an ellipse. Earth moves on an ellipse.