Did not come is correct?

It is imperative for the first form of the verb to be used in juxtaposition to “did”. And that is why, “didn’t come” is correct, which is clearly the first form of the verb and not the third, which is also the same, the three forms being: come-came-come.

How do you say are you coming or what in Spanish?

Are you coming or what? ¿Vienes o no? – Ya voy.

What does when you come mean?

When will you come is more like asking a person a specific time of his/her arrival (probably because you’ll be waiting). When do you come, on the other hand means, generally asking a prson about his/her usual timings of arrival.

Which is correct not yet come or not yet came?

Both are incorrect, according to me. Instead one should say either “ The answer is yet to come” meaning that you are still awaiting the answer. Or one could say “ The answer is not yet come” , which still means that you are awaiting the answer.

What does “why have you not come today?

“Why have you not come today?” is present perfect tense. Present perfect tense links the present with the past. If you have not come today, it means that you didn’t come yet and you’re still not here, but you might be coming in the future.

Is the Order of ‘why don’t you come here’ grammatical?

No, the order “Why do not…?” is no longer grammatical in contemporary English. Regarding the “What’s the difference?” question, if you correct the first sentence to “why don’t you come here?”, then the difference is: “Why don’t you come here?” is most often used as a suggestion.

Is it grammatically correct to say “today” or “todays”?

It is grammatically correct to say “today” in that the word “today” can function as a noun or an adverb. On the other hand, you cannot say “todays” because the word “todays” does not exist in the English language.

Which is correct “you are coming today is it or not”?

You asked: Which is correct- “You are coming today, is it?” or “You are coming today, are you?” My answer is that both are incorrect. The intention of your question is to confirm that someone is coming today. The first one, “You are coming today, is it?” is completely wrong.