conlangs1-3  Exercise 1: Building Esperanto Words
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  (a) mal- + bona      = malbona      "bad" (the opposite of good)
  (b) lerni + -ej- + -o = lernejo      "school" (a place where one learns)
  (c) libro + -j       = libroj       "books" (the plural)
  (d) lerni -> lern- + -os = mi lernos "I will learn"

How each step works:

  (a) mal- reverses the meaning of any word.
  (b) -ej- means a place for an action; add the noun ending -o after it.
  (c) -j marks the plural on nouns.
  (d) The verb root lern- takes -os for the future; mi is "I".

Check that your forms keep the word-class ending (-o, -a, -e, -i or the verb
tense ending) at the end.