【正文】
Compare the following two groups of words: Group1: house milk driver games Group2: What is he doing? revision, preparation, decision, difference No exact word can be given. Perhaps… which part of speech is each word ? Think about the similarities and differences between the two groups. All the words are nouns, but words in Group1 refer to physical things and those in Group2 refer to ideas, actions, and qualities. The nouns in Group2 are called abstract nouns, and we always use them to say something we can not see or touch directly. Change the following words into nouns by adding suffixes. production p