We usually use pronouns to refer back to people or things that we already mentioned.
Can we use pronouns before we mention the noun?
A: Are you going to the game?
B: No, it's sold out. There aren't any tickets left.
We usually use pronouns to refer back to people or things that we already mentioned.
Can we use pronouns before we mention the noun?
A: Are you going to the game?
B: No, it's sold out. There aren't any tickets left.
As Rob K mentions in his answer: In your example A has already defined the context, so "it" is perfectly clear.
However, it is not uncommon to say a pronoun without context, but it is awkward since the listener would not know the reference. You would have to add some further explanation what you mean.
A. I'm sorry, it's completely sold out
B. What are you referring to?
A. The game. It's completely sold out.
I don't think this is unique to English, since it's more about the general quirks of pronouns or any ambiguous part of speech.
The noun ("the game") has already been mentioned by the questioner, so it's understood from context that 'it' refers to the game.
It is also used for the impersonal form in English or when referring to something implied.
For example: It's raining ("it" apparently being the weather.) It's Friday ("it" refers to the day.)
It can also be used before the thing it describes for emphasis:
It's illegal to litter (could be "to litter is illegal" and "it" must refer to the act of littering.) It's dangerous to go alone ("it" refers to going alone before it is introduced.)
To add to the good answers dealing with the specific case mentioned in the question, it's also possible to use a pronoun before the noun without other context to help, as in the first line of Philip Larkin's poem (I've replaced the second word with a rough synonym):
They [mess] you up, your mum and dad
It's certainly possible that "it" references something not said yet.
For instance, one might say "You know it's going to to be expensive, if you can buy the new popular toy at all this Christmas". Here, "it" refers to "(to buy) the new popular toy" which is not mentioned yet.
This is of course equivalent to "You know the new popular toy is going to to be expensive, if you can buy it at all this Christmas" - you just swap the subjects.
Just to summarize what everyone's saying: The antecedent does not have to be explicitly mentioned, but obviously the speakers need to know what is being referred to, which they typically will through context.
Yes, English allows pronouns to be used before the thing they refer to.
The quote in your question is not an example of this usage, since the "it" in the answer refers to "the game" in the question, which has already been mentioned. It is very normal to use a pronoun to refer to something which has already been named during the conversation:
Is Mary there? No, she went out. When will she be back? I don't know. She didn't say.
All of those pronouns refer to "Mary", who was mentioned by name in the first sentence.
But it is quite common to use pronouns, especially "it", before the thing they refer to. Or even, in the case of "it", without a reference at all.
The sentence which I just wrote is an example of one of those usages. "But it is quite common...". Here, the pronoun "it" can only refer to the action which follows: "to use pronouns...".
I could have avoided that by writing "Using pronouns, especially 'it', before the thing they refer to is very common." But practically no-one would write that because the property "is very common" is too far away from the action "Using pronouns".
To me, the second version sounds unnatural, which is why I didn't write it that way in the first place. I wanted to emphasize the commonness of the act, so I had to put that first in the sentence. There are languages which allow the copulative ("is") to come first in a sentence, but not in English:
(Incorrect) Is very common to use pronouns before...
In order to make that a correct English sentence, I have to put a subject before the verb "is", so I choose the "dummy" pronoun "it".
Another even more common form of the dummy pronoun is the so-called "weather it". This use of "it" is called the "weather it" because it is almost needed to talk about the weather:
It is still raining.
It was warmer yesterday.
It's going to be a great day tomorrow.
Some people say that this "it" refers to the general state of the world, or something like that. But mostly it is just grammatical filler. "Raining" is a verb, so the grammar requires a subject.
Another example of dummy subjects is sentences which start "There is" or "There are":
There are lots of people waiting for me.
There is a great film at the cinema.
Again, the pronoun "there" is being used only because the grammar requires it. You could say that the pronoun refers to the line of people or the excellent film, but I don't think that is really correct. You couldn't replace the pronoun with the thing it is supposedly referring to:
(incorrect) A great film is a great film at the cinema.
With a few verbs, you need to use a dummy "it" as an object:
I hate it that you can't see in the dark.
Or maybe you don't need to use it: some English speakers would find it equally natural to say "I hate that you can't see in the dark". How strong the need to insert an "it" depends both on the speaker and the particular verb. "Hate" really seems to want the "it", whereas "think" doesn't allow it at all ("I think it that..." is wrong). This particular usage is a lot more common in German, and I suspect that is why in English it is used more with some verbs (with Germanic roots) than others.
Finally, there are cases where pronouns are used before the thing they reference for reasons of emphasis, or style, or just because it sounds good. Linguists call these "cataphoric pronouns", but there is little agreement about what their function is. For example:
As soon as he got home, John called his mother.
This is a real reference; we could put the noun first and the pronoun second and the sentence would sound just as natural:
As soon as John got home, he called his mother.
These two sentences are not identical, but it is very hard to say what the difference is. Some linguists would say that the first sentence "started out" as:
John called his mother as soon as he got home
and that it was transformed by putting the phrase "as soon as he got home" at the beginning of the sentence, in order to create some shade of meaning. So the pronoun was "originally" following the reference, but when the sentence finally found its way into the speaker's mouth, the words just came out in a different order. But if that were the case, how could "As soon as John got home, he called his mother" be correct? Yet it certainly is correct, and it is probably exactly as common as the cataphoric usage (where the pronoun comes first).
In any case, this is not always possible. For example, no-one would say:
(incorrect) As soon as he got home, he called John's mother.
because the pronoun "he" cannot apply to "John" in this case. The mother being called is John's mother, not the person who just got home, who is not named (and should have been referred to before).
Unlike the dummy pronoun uses, which are often required, this usage is totally optional, and language learners should probably use it with care. But you will find many examples in both spoken and written English.
There's a joke based on this mistaken notion. It roughly goes like this:
Wife: Can you get 2 sticks of butter from the supermarket, and if they're available a dozen eggs?
Husband: OK!
...
Wife: Did you get the eggs?
Husband: No, they were all out of butter.
"They" obviously should refer forward to "a dozen eggs", not back to "sticks of butter."
Is that it?
Native English speaking children all eventually discover the game of asking everybody to "Spell it!" is quite fun.
Consider two people have a dispute:
No it's not.
Yes it is.
Is it a bird? Is it a plane? No! It's It! It can do even more than lame old superman!