Verb Forms Quiz - Gerund or Infinitive? (c) Elek Mathe / Self-Study Quizzes for ESL Students 

 http://www.aitech.ac.jp/~iteslj/quizzes/9801/el-to-ing.html

'- ING' FORM: GERUND OR INFINITIVE? (c) online English Grammar / Antony Hughes

 http://www.edufind.com/english/grammar/ING6.cfm

'- ING' FORM: VERBS FOLLOWED BY THE GERUND (c) online English Grammar / Antony Hughes

http://www.edufind.com/english/grammar/ING4.cfm

 '- ING' FORM: GERUND OR INFINITIVE? (c) online English Grammar / Antony Hughes

http://www.edufind.com/english/grammar/ING5.cfm

 '- ING' FORM: THE GERUND (c) online English Grammar / Antony Hughes

 http://www.edufind.com/english/grammar/ING3.cfm

 Gerundium: Ersetze die Verben in Klammern durch das Gerundium. 

 http://www.edufind.com/english/grammar/ING3.cfm (c) online English Grammar / Antony Hughes

 http://www.ego4u.de/?n1=0&n2=Gerundium&m1=0&m2=5 © English Grammar Online 4 u

 Infinitivkonstruktion: Verwende eine Infinitivkonstruktion. © English Grammar Online 4 u

 http://www.ego4u.de/?n1=0&n2=Infinitivkonstruktion&m1=0&m2=6

Gerund / infinitive: Theory © Virtual ESL Grammar

http://www.james.rtsq.qc.ca/Virtgram/gerundth.htm

gerunds: gap-fill exercise © Virtual ESL Grammar

http://www.james.rtsq.qc.ca/Virtgram/gerund.htm

What is the '-ing' form of these verbs? © better-English.com

 http://www.better-english.com/grammar/theingform.htm

Infinitive or Gerund © e-anglais.com

http://www.e-anglais.com/exercices/infin_ger.php

Infinitive or Gerund (2) © e-anglais.com

http://www.e-anglais.com/exercices/infin_ger2.php

Infinitive or Gerund (3) © e-anglais.com

http://www.e-anglais.com/exercices/infin_ger3.php

I ... to do it / I ... doing it © ESL Blue(s)

http://www.collegeem.qc.ca/cemdept/anglais/infgerun.htm

http://www.collegeem.qc.ca/cemdept/anglais/infgeru2.htm

Verbs Followed by Gerunds, Verbs and Prepostions Followed by Gerunds, Gerund and Infinitive Practice, 

Method "by verb+ing", Verb & Adjective phrases Followed by Gerunds, Parallel Phrasing with Gerunds,

Gerund and Infinitive Flash Cards, Verbs that Command: © Grammar Check

http://www.smccd.net/accounts/sevas/esl/gramcheck/#infinitives