How should I say when talking abt someone whose gender I don’t know?

Just using singular "they" is fine. Singular they is gender neutral and can be used in cases like this. Some people will call it improper grammar but those people are wrong.

They/them can be used as singular for a person of unknown gender

Use they! Conjugate it like normal (they are), even when you’re talking about one person

You can at least in British English use They when the gender is unknown.

Just use ‘they’! It can be singular (like in this case) and it’s the most simple in speech and writing

They/them is the most common, with a history going back to late Middle English.

Many people default to whichever gender they are themselves, I call anybody "he" in a hypothetical where the gender is unspecified, but in cases where I just can't really tell for certain what their gender is, then I say "they"

You may hear (likely older) people say he/she (pronounced as "he slash she" even), but that's pretty outdated use at this point. Many people who insist it must be "he/she" instead of "they" do so out of stubbornness against folks who prefer to go by "they" rather than a gendered pronoun.

*They* is the simplest answer. Before singular *they* became acceptable in formal English, but after epicene *he* became controversial, we had to avoid using pronouns or change the nouns to grammatical plurals.

Is usually used they/them as singular pronouns.  Example  Someone left their phone on the table. I hope they come back for it.

always use they if you don’t know the gender.

Just use the generic "she".

They

Singular they is always correct where referring to an indefinite ("generic"/nonspecific/unknown) person, as in the examples you give. You will sometimes see or hear people just pick either 'he' or 'she' and that's understood just fine, but it tends to reinforce unfortunate gender stereotypes (such as defaulting to "he" for any surgeon and "she" for any nurse) so it's better to avoid that unless the context makes the sex or gender of the person you're referring to relevant. For example, if you're discussing patient care standards after a vasectomy, it's reasonable to refer to the generic patient as "he". Singular they can also be used, but is not always the best choice, if you're referring to a specific individual, but you don't happen to know their gender. Again, context is important. If this person is someone you will have an ongoing relationship with, ask their pronouns and refer to them accordingly. But if you mean the total stranger who just drove past you, and for whatever reason you want it to be immediately clear that you mean the driver only, not everyone who was in the car, it's fine to take your best guess based on the person's appearance and say something like "did you see his hat?" It hurts no one if your guess happened to be incorrect.

Use “they”. He and she are gendered (masculine and feminine), and “it” is only used for things like inanimate objects rather than people. So “they” is the correct choice

touch them gently.... it proves you're harmless... then gently now... slowly move in.. and,,,,,, sniff their earlobes.... mmghhffg.. god....

In addition to singular "they," English also has the indefinite pronoun "one" which you may use in place of "a person" in such cases. E.g., your second example could be written "if one falls off a building..."

As others have said, they. However there is a rule of grammar, now out of favour, that you should always default to masculine and use “he”. I mention this so that you understand it when you see it. Do not use it. (For some reason a lot of board game instructions still use this outdated rule).

you use they/them pronouns. Although you CAN use she/he/they in place of that, it gets infuriating to write after a while.

Lots of people would say 'he "slash" she' or 'he or she' which can make sentences clunky, but usually you'd use 'they' when talking about someone of an indeterminate gender.

Colloquially, "they" can be used. In formal English, one should use "he". In legalese, I believe "he or she" would be the norm.

They Is common usage. Used to be he, now it's they.

'they' is also used for a single person of unspecified gender, using the same conjugations as though it were plural; 'they are' not 'they is' (though you may hear 'they is' occasionally, in certain dialects of english.) Also, in extremely formal speech (like, laws, contracts, butler characters on TV, stuff like that), 'one' might be used as well. i.e. 'if one were to fall off a building, would one survive?' In this way, 'one' conjugates the same way as 'he' and 'she'; 'one is' not 'one are'.

"They", referring to an undefined singular person, is the correct choice. In most cases I can think of, as in the example above, "they" is grammatically singular, but implicitly refers to any one of many people. Another example, "if someone calls, tell them I'm not available". Again grammatically singular but not referring to a specific person. The use of "they" for a specific person is also correct, but nevertheless sounds wrong to many native speakers. "Karen left their phone at home", doesn't fit the speech pattern many of us grew up with, but it is gaining acceptance.

Using singular they is by far the most natural option. Saying "he/she" or "he or she" is wordier and makes less sense. Lots of people get mad about this, but it's been in use for >500 years, so if they say it's about tradition, it's not.

they/them its not your fault woke culture is weird

“They” is used when you don’t know or when you are talking about more than one person.

Use singular 'they'. In my English dialect it has always been used in such situations. Indeed, it is even used when a person's gender is known, e.g.: 'He was here five minutes ago, and they said .. '

I am surprised to see how completely the singular they has become the preferred pronoun in English. As much as I still cringe when I see it, it’s much better than saying/writing “he or she” over and over.

Just use singular “they.” The word they has been used for centuries as a gender indeterminate singular third-person pronoun. Yes, formal writing defaulted to he for much of English history, and then an awkward he/she for much of the last century, but this is rarely the case in spoken English or everyday writing. Even the people who complain about singular they tend to use it in conversation without realizing it because it’s so natural for native English speakers.

theeey

They

At some point in the last maybe 150 years some grammarians got their undies in a bundle and style guides came up with all manner of awkward solutions to avoid the simple and ancient “singular they”. These were the same fops who said we couldn’t split infinitives (because Latin didn’t even though English is not a Latin-based language) and we couldn’t use dangling prepositions. Use “they”. It’s correct, efficient, and keeps the focus on the action instead of the (irrelevant) gender of the subject.

They. Lots of languages only have they not she / he.

i just don't use genders anymore. i've had enough hr training to change my habits. i wouldn't even call it extreme i just don't think that way anymore.

Most of us would say they in this context. If I were writing an essay I’d simply say “would he or she survive”.

Technically, "he or she" is proper English, but "they" is also acceptable, less awkward to say, and more inclusive.

Well in correct English, you’d use him. Same with Spanish etc. a lot of kids now will tell you to use “they/them” which is the group pronoun for more than 1 person. If a rich person were in my place, what would he do? This is the neutral and correct way to say it. Now though, the prevalence of “they/them” has increased their usage to extend to unknown gender usage. Mostly due to political ideologies pushing that usage more.

When I was a boy, "he" would have been considered correct, but in the early 1970s progressives started insisting that anyone who spoke that way was marginalizing and oppressing women and over the last 50 years they've managed to wear down most of the rest of the population. You'll get less grief if you use the numerically nonsensical "singular they".