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Making adjectives into nouns:（形容词转为名词）
-ce
important - importance
patient - patience
violent - violence
-ity
popular - popularity
formal - formality
regular - regularity
-ness
happy - happiness
lazy - laziness
ruthless - ruthlessness
-y
difficult - difficulty
modest - modesty
honest - honesty
Some spelling rules:（拼字的规则）
When the adjective or noun ends in –e, -t or –y, sometimes its spelling changes.
For example:
-e
nature - natural
fame - famous
-t
important - importance
patient - patience
-y
happy - happiness
lazy - laziness
