Student or Learner
A couple of weeks ago, when I was asked to mark students' English workbooks, I found something confusing in them.
When people compare things of the same trait, they would use "as Adj as" to describe them.
For example, Tom is as tall as John.
However, if the above sentence is turned into a negative one, must the first "as" turned into "so"?
"Tom is not so tall as John". (And it means Tom is shorter, right?)
Could I say "Tom is not as tall as John." (And this may mean which is taller is unknown?)