«50.» «The Ablative Relation.» The ablative case is used to express the
relations conveyed in English by the prepositions _from_, _with_, _by_,
_at_, _in_. It denotes

1. That from which something is separated, from which it starts, or of
which it is deprived--generally translated by _from_.

2. That with which something is associated or by means of which it is
done--translated by _with_ or _by_.

3. The place where or the time when something happens--translated by
_in_ or _at_.

_a._ What ablative relations do you discover in the following?

In our class there are twenty boys and girls. Daily at eight
o’clock they come from home with their books, and while they are
at school they read with ease the books written by the Romans.
By patience and perseverance all things in this world can be
overcome.

«51.» «Prepositions.» While, as stated above (§41), many relations
expressed in English by prepositions are in Latin expressed by case
forms, still prepositions are of frequent occurrence, but only with the
accusative or ablative.

«52.» RULE. «Object of a Preposition.» _A noun governed by a preposition
must be in the Accusative or Ablative case._