Check that GERUND should be used after PREPOSITION.
Examples:
incorrect : She is clever at written poetries.
correct : She is clever at writing poetries.
incorrect : He left without to say anything.
correct : He left witout saying anything.
incorrect : Thank you for return the book that I lent you.
correct : Thank you ...
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Written by Belajar Toefl Dot Com on January 5th, 2010