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Ахахахах

Pls explain the joke here, im a little slow on the uptake this evening

Maybe where you live, but I'm also a native English speaker, and where I live, there's nothing wrong with this translation. Leaving "do" out can give the question a slightly different connotation, depending on the tone of voice.

I agree with you

I answered what you suggested and it was a correct answer.

That is!

Yes it is, because the verb tells us which person we are referring to. It's the same in Spanish. :)

Actually English Vernacular does this too "Do you want to/a go?" -> "Wanna go?"

No, we put a comma even with "что": Думаешь, что я всё знаю? This is a complex sentence, and you have to put a comma between its parts.

I was taught in class that it was both. I think it's supposed to be Я думаю, что Я, Ты, Вы, etc. But that's all I know.

It is strange. Because there are many cases when one could omit что in complex sentences. Where did you read that?

As far as I know a lot of English speakers and even professional writers omit 'that' in way you used it.

English lesson: A word-for-word translation into English would be "Think, I everything know?" To the native English-speaker, this looks like a mess. To start out a sentence with the base verb followed by a comma could colloquially be interpreted as a command, but it's supposed to have a semicolon instead of a comma because "think" by itself is in the imperative, and, therefore, an independent clause. But in Russian, "Думаешь?" means "Do you think?", NOT "Think.". So after putting the object and verb in standard English order, we're left with "Do you think, (do I know everything / I know everything)?" It's easy to think that "я всё знаю" is the question because it's the correct way to say both "Do I know everything?" AND "I know everything." in Russian. But since "думаешь" came first, we can safely assume that the person being questioned is "you," and not "I". So we're left with "Do you think, I know everything?" The comma is necessary in Russian, but it would be incorrect in English because "I know everything" is the object of "think" (what "you" are thinking). So that's how we arrive at "Do you think I know everything?" Yes, I know, English is a logical, insane, stupid, sophisticated, simple, and complicated language. That's why I'm here learning alternatives.

I suppose it makes literal sense in a context where someone is talking to themselves, though in that context it doesn't make much practical sense (you would never say that to yourself, I guess).

In any case, the verb "to think" here is in the ты form (see https://en.wiktionary.org/wiki/%D0%B4%D1%83%D0%BC%D0%B0%D1%82%D1%8C#Russian), indicating that your version should be "You think, do I know everything?" which is quite Yoda-like and would feel more natural as "do you think I know everything?".

In that case "think" seems to be used as the imperative form of the verb, so the Russian translation should correspond to that by having the verb "думать" conjugated likewise, in imperative, but I'm not sure if its imperative form is different from "думаешь"...

Both are correct, but they say всё знаю do we gotta learn what they do say and accept that fact)

думаешь ending with ешь which is for the word ты , the sentence may write ты думаешь, я всё знаю? , this is what i guess i need suggestion too