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In the following sentence which proposition should I use?

> Metals are needed ... the green technology.

  • a) for
  • b) to

How about this sentence?

> Metals are needed ... power electric cars.

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    Green technology is a noun phrase. Power here is a verb. Does that help? Commented Dec 15, 2022 at 13:38
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    This entire question is a red herring. You just need to learn the difference between the prepositions "to" and "for", which you could do from a dictionary.
    – Astralbee
    Commented Dec 15, 2022 at 14:55
  • You're right, I'm sorry. Instead of to vs for I googled this question's title but I didn't find any useful content so I asked in this forum. I thought it was something about verb need's preposition. @Astralbee Commented Dec 15, 2022 at 15:16

1 Answer 1

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Based on your comments, I believe what you're really asking is what the difference is between "are needed for" and "are needed to".

"...are needed for..." is always followed by a noun phrase because "for" is a preposition.

"... are needed to..." is always followed by an infinitive verb because that's the infinitive "to", not a preposition at all.

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