Work in pairs. Which of the suffixes or prefixes underlined in the words below

II.  Work in pairs. Which of the suffixes or prefixes underlined in the words below ... 
1 forms a noun? ness
2 forms an adverb? 
3 form an adjective? 
4 give a word an opposite or negative meaning? 
fitness   stressful   reasonable   inactive    irregular    risky generally   careless   unusual