+ s = plays
+ ing= playing
+ ed = played
+ er = player
play
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This knowledge might remain quite abstract if we didn’t know what to do with it, if we didn’t know that these prefixes and suffixes can be used to understand words, especially to deduce the meaning of words  by looking at the way they are built. These elements can become strategic, in the sense that they can help us to find and use a strategy to solve the problem of an unknown word.