I was wondering if someone could please help me confirm whether or not, after a relative pronoun preceded by a preposition, you can follow up with an infinitive immediately afterwards or if you have to construct a sentence segment featuring a fresh subject (and possibly auxiliary verb). Naturally, I have examples to clarify this query:

Is this possible:

This will be a good vantage point from which to rain fire down upon the enemy.

Or does it have to be phrased like this:

This will be a good vantage point, from which we can rain fire down upon the enemy?

The first of the two feels possibly correct, but I am not certain if it is strictly so.

  • 1
    Both are grammatical, if somewhat wordy. The first one is a relative infinitive construction, which allows Pied-Piping, and requires a Wh-word in that case; otherwise Wh-words are forbidden in relative infinitives: the book to look in ~ the book in which to look ~ *the book which to look in. The second sentence is a normal (not infinitive) relative clause, also with Pied-Piping. Both types are restrictive relatives, so there should be no comma in the second sentence. – John Lawler Nov 3 '16 at 14:27

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