<p>This is what it says:</p>
<p>But this is due to the fact that at is unnecessary, as where already indicates location; it is
not directly due to the preposition’s being at the end of the sentence. In fact, there are
some times when moving the preposition from the end of the sentence is incorrect:
I ran up the restaurant tab. Up what did you run?
Why is that second sentence wrong? Because run up is a phrasal verb; it consists of the
verb run and the particle (a cool name for the preposition of a phrasal verb), which is up in
this case. The components of a phrasal verb cannot be separated. Some other phrasal
verbs: make up, run into, and show up.</p>
<p>isnt ran up right? Is it trying to say that it should be run up? please explain</p>