*When masculine nouns begin with a vowel or silent 'h', cet is
used.
The above demonstratives are used with nouns and are technically adjectives.
Ce is equivalent to 'this' & 'that' however it is used only with
the verb être. It is shortened to c' when être
is in a form that begins with an e.
The following demonstratives are used to point out objects.
Normally either -ci, indicating that the object is near, or -là,
indicating distance, is attached to these pronouns.
Finally there is cela, and it's informal equivalent, ça.
Both can be use to refer to objects as well as the indefinite- things like ideas
and events. They are often used when making general statements about something.
or when an object is unknown.