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He is addicted to watching movies. Why the writer used gerund after the preposition "to"? , because as known, we use the infinitive after the prepostion (to).

Bavyan Yaldo
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    We never use the infinitive after the preposition to. The particle to is used to mark the infinitive, e.g. "to watch". There, to is not a preposition. – P. E. Dant Reinstate Monica Jun 22 '17 at 20:43
  • So, what we call this case when a gerund comes after to? – Bavyan Yaldo Jun 22 '17 at 20:52
  • In this case, the gerund is part of the noun phrase "watching movies", which is the object of the preposition to. – P. E. Dant Reinstate Monica Jun 22 '17 at 20:54
  • Prepositions are among the most difficult parts of speech in English for a new learner to understand, and it is even more difficult when you see to and find that it is not always a preposition! It may be easier if you use the word infinitive to mean the entire phrase, e.g.: "to watch, to eat, to laugh," and refer to "watch, eat, laugh," etc, as the unmarked or bare infinitive. – P. E. Dant Reinstate Monica Jun 22 '17 at 21:03
  • Grammatically or meaningfully, what would happen if I exchanged the word watching ( a gerund ) with watch ( bare infinitive) ? – Bavyan Yaldo Jun 22 '17 at 21:26
  • Well, then you would have the very ungrammatical sentence "He is addicted to watch movies," which every English speaker would read as nonsense! – P. E. Dant Reinstate Monica Jun 22 '17 at 21:28

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To here is an ordinary preposition, not the infinitive marker. With words derived from the stem addict- it introduces the substance (literal or metaphoric) to which one is addicted:

The thief was addicted to heroin.
She has an addiction to 17th-century metaphysical poetry.
He is addicted to making snarky comments on ELL.

The -ing form is employed here as a 'gerund'—that is, a verbform which may act externally in most roles of an ordinary noun, including standing as the object of a preposition.

StoneyB on hiatus
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