3

I realized him on/at the first time I enter the room.

Which preposition should I use “on” or “at” in sentence above or Does both have the same meaning?

2

according to the Longman Dictionary of Contemporary English :
(for) the first/second/last etc time. for example:

Gerry had just had back surgery for the third time in two years.

I realized him for the first time I enter the room.

  • "I realized him for the first time I enter the room." Isn't that still ungrammatical? "Realized" is awkward and it would be "entered", no? – BruceWayne Feb 16 at 21:11
  • "For the first time" is a phrase that makes sense, and "the first time I entered the room" is a phrase that makes sense, but "for the first time I entered the room" doesn't make sense to me. – Tanner Swett Feb 17 at 4:56
1

I don't know what you're trying to say, but I'm guessing it's this:

I realized it was him the first time I entered the room.

The phrase "I realized it was him" tells you what happened and the phrase "the first time I entered the room" tells you when it happened. No preposition should be used here.

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