It is important to be able to recognize word forms. Why? So that when you learn a new word, you will be able to use it properly. Many learners struggle to know the difference between 'confidence' and 'confident', for example. However, if you understand word forms, and you have a dictionary, you can work it out for yourself.
There is a new exercise on Road To Grammar at www.roadtogrammar.com/wordforms that will allow you to practice over 300 word forms at easy or advanced level. The questions are randomized and you will be retested on incorrect answers. At the end of the quiz, you will have a chance to review any wrong answers.
Best of luck with your English!
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