1. that - Noun
2. that - Adverb
3. that - Pronoun
4. that - Conjunction
6. that - Determiner
As a demonstrative pronoun (pl. Those), that usually points out, or refers to, a person or thing previously mentioned, or supposed to be understood. That, as a demonstrative, may precede the noun to which it refers; as, that which he has said is true; those in the basket are good apples.
As an adjective, that has the same demonstrative force as the pronoun, but is followed by a noun.
As a relative pronoun, that is equivalent to who or which, serving to point out, and make definite, a person or thing spoken of, or alluded to, before, and may be either singular or plural.
As a conjunction, that retains much of its force as a demonstrative pronoun.
To introduce a clause employed as the object of the preceding verb, or as the subject or predicate nominative of a verb.
To introduce, a reason or cause; -- equivalent to for that, in that, for the reason that, because.
To introduce a purpose; -- usually followed by may, or might, and frequently preceded by so, in order, to the end, etc.
To introduce a consequence, result, or effect; -- usually preceded by so or such, sometimes by that.
In an elliptical sentence to introduce a dependent sentence expressing a wish, or a cause of surprise, indignation, or the like.
As adverb: To such a degree; so; as, he was that frightened he could say nothing.
Source: Webster's dictionaryThe most important thing is to enjoy your life – to be happy – it's all that matters. Audrey Hepburn
The world has become so fake that people thank you for a lie and get offended by the truth. Source: Internet
Three things in life that can destroy a person: - Anger, pride, lack of forgiveness. Nikolaj Velimirovic
He who buys useless things, later sells things that he needs. Japanese Proverb
Courtesy that is all on one side cannot last long. French Proverb
The punishment of a liar is that he is never believed, even when he speaks the truth. Jewish Proverb