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There is a product called "FUEL DOOR OPENER", lets say.

If it is responsible for opening and locking of a particular type of fuel door, is the following sentence correct?

ACTUATOR that is responsible for the opening and locking of PUSH&PULL type fuel door.

When do I put, and not put the article before a verb? Is this even correct?

Also, I saw in some sentences, the article is placed before a noun too. In the above sentence, should "the" be placed before PUSH&PULL type fuel door?

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    You have a choice: Either '...responsible for the opening and locking of the PUSH&PULL type fuel door'. Or '...responsible for opening and locking the PUSH&PULL type fuel door'
    – Shoe
    Commented Oct 17, 2020 at 9:42
  • The definite article before 'opening' is optional and there is little if any difference in the meaning with or without it. However the part of the sentence which says "...locking Push &Pull type fuel door is wrong. It should either be "...locking the (or a ) Push & Pull type fuel door" or "...locking Push & Pull type fuel doors".
    – BoldBen
    Commented Oct 17, 2020 at 12:35
  • Those verbs are gerunds, which function as nouns.
    – Robusto
    Commented Oct 17, 2020 at 13:02

1 Answer 1

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The short answer to your question is never.

Articles are elements of noun phrases, not of verb phrases. Therefore they cannot be used with verbs, only with nouns.

  1. This gizmo is responsible for opening the door.

  2. This gizmo is responsible for the opening of the door.

In sentence (1), you have a verb phrase so you do not use an article. You know it is a verb phrase because it has a direct object: the door. We do not use prepositions to connect a verb’s object arguments to that verb. However, because this particular verb phrase is acting as the prepositional complement for the preposition for, some folks also refer to it as a gerund clause. In any event, articles are forbidden at the start of verb phrases like this.

In sentence (2), the all-important addition of the preposition of to connect the -ing word to the door following it means that that door is no longer the direct object of any verb, just the second of two nouns connected by a normal preposition. Because now it is a noun phrase, the article is allowed.

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