ING FORMS AND INFINITIVE FORMS EXERCISES:
http://www.englishgrammarsecrets.com/ingform/exercise4.html
http://www.englishgrammarsecrets.com/ingform/exercise2.html
http://www.englishgrammarsecrets.com/ingform/exercise3.html
http://www.englishgrammarsecrets.com/ingform/exercise5.html
http://www.englishgrammarsecrets.com/ingform/exercise1.html
http://www.englishgrammarsecrets.com/ingform/exercise6.html
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