ABSTRACT
Only 2 and 4 are sentences: all the others require a verb if they are to make complete sense. The exercise, simple enough, visually stresses an important point: sentences can be very short, and mere phrases can be quite long. The shortest structure in those six is the three-word 2, but it’s a complete sentence; 6 already has eleven words but will need even more to become independent. That neatly sets up our next topic.
