<span>when your higher in rank, or higher status, or quality.</span>
<em /><u><em>"She did not understand what happened."
</em></u>It is a complete sentence since it has a subject (she) and a verb (understand), and is independent (i.e. doesn't require another clause to make sense<u><em>
</em></u>
Plentiful.
Hope this helps!
The foreign translation the definitions