В чем разница между "somebody", "someone", "anyone", "anybody", "some person"???

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Someone and somebody are both pronouns that are used to refer a person who is not known or specified. In most contexts, they are interchangeable.

The only difference that most native speakers can agree upon is that someone is more formal than somebody (just as anyone is more formal than anybody, and everyone is more formal than everybody). This means that in a sentence like the one below, used in a legal context, someone is a much more likely choice than somebody.

The bank requires that the deed be signed by someone authorized by the courts.

It’s also interesting to note that someone is used more frequently than somebody, according to the data that we have on language use.

"somebody", кто-то
"someone", некто
"anyone", кто угодно
"anybody", кто угодно
"some person" какой-то человек.

somebody = someone

anybody=anyone

Все переводятся как "кто-то".Но anybody и anyone в утвердительном предложении переводятся как "кто-угодно". anybody и anyone используются в вопросах и отрицаниях, а в утвердительных предложениях используются somebody и someone.

some person - какой-то человек

someone (somebody-разг) - определенный, особенный
anyone (anybody-разг) - любой из

some person - определенный человек (не любой)

https://www.youtube.com/watch?v=cueulBxn1Fw

somebody - кто-нибудь
someone - кто-то
anyone - кто-либо, кто угодно
some person - кто-то, какой-то человек (персона)

а по сути практически одно и то же.