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13-1 Verb + gerund
13-2 Go + -ing
13-3 Verb + infinitive
13-4 Verb + gerund or infinitive
13-5 Preposition + gerund
13-6 Using by and with to express how something is done
13-7 Using gerunds as subjects; using it + infinitive
13-8 It + infinitive: using for (someone)
13-9 Expressing purpose with in order to and for
13-10 Using infinitives with too and enough
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