Gerunds and infinitives are non-finite verb forms that can be used in different grammatical constructions. Gerunds function as nouns and can be subjects, objects, or follow prepositions. Infinitives can be used with certain verbs, adjectives, nouns, and modal verbs or to express purpose. Both gerunds and infinitives can be used in complex grammatical forms.

1. Gerunds vs. Infinitives

2. Gerunds Subject/Object of a sentence After prepositions With certain verbs Noun phrases (e.g.: have difficulty, have trouble)

3. Infinitives Infinitive with to With certain verbs Adjectives Nouns Something/Nowhere + infinitive Infinitive of Purpose Infinitive without to Modal Verbs ’d better and ’d rather Let, make, help

4. Complex Infinitive and Gerund Forms