Fill in the Blanks Gerunds and Infinitives Fill in the BlanksOnline version Test your knowledge of gerunds and infinitives by completing sentences with the correct forms. by Geraldine Díaz 1 Gerunds subjects complements verbs objects infinitives ing 'to' English grammar verb phrase nouns base form and are forms of that function as . Gerunds end in - and infinitives are the of the verb preceded by . They can be used as , , , or as part of a . Knowing when to use gerunds and infinitives correctly is essential for mastering .