That

Demonstrative Determiner / Pronoun

That is a demonstrative determiner, it allows you to explain which N you are talking about: that car, that broken cup, that one.

	-ci	-là
celle celui	this one	that one
celles ceux	these (ones)	those (ones)

Subordinating conjunction / complementizer

• introduces a complementary clause
• very similar to the French word que in function if not in form. One notable exception is the comparative where English uses than and as rather than that.
• can be dropped in many (though not all) sentences. This is often noted as ø in grammar books.