Questões da Prova FUNDATEC - 2017 - BRDE - Analista de Projetos - Engenharia

If we add the prefix '-UN’ to some words in English, we can get the opposite of that word, like in ‘unwanted’ (l. 29). In this sense, consider the following words and analyze them:

I. able.

II. happy.

III. fair.

IV. acceptable.

Which of them can be an opposite just by adding the prefix ‘-UN’? 

Considering the text, it is possible to say that:

I. Having bad thoughts can be dangerous for people who cannot control themselves.

II. Accepting negative thoughts can help to minimize their effects.

III. Most people who have negative thoughts had a bad experience during childhood.

IV. Seeing a therapist can help people to recover from the effects of negative thoughts.

Which of them are correct?