That depends on what you are saying/asking. If you say something like "Later today, where will you be at?" or "Which restuarant is the salad bar at?" then that is correct. Saying "At 5:00 I will be at." is incorrect. When saying something like this, it's an incomplete sentence. In this example, you need to state where you will be at. This would be the correct way to finish the sentence: "At 5:00 I will be at the Matthew's house."
there is a famous nava message"Sighted ship, sank same"
While it is common in casual speech to end a sentence with "at," it is considered informal and unnecessary in formal writing. In formal writing, it is better to say "Where is Jimmy?" or "Where is Jimmy located?" to avoid ending the sentence with a preposition.
Yes. This and these can be determiners or pronouns. They can be subject or object pronouns. Hey look at this! What do you think of this?
The/This data is okay.
Yes you can. Example: Okay, I will go with you.
okay
Its a verbal tic and likely a mild form of Tourettes Syndrome. The same people will say "alright" at the end of every sentence comparably as much as they say "okay".
Yes.
It's okay for you to stay.Yes as in For example, .... and For once in your life, do the right thing.
Yes.
okay here is a sentence: "I don't know what prognostication means!"
You can only end a sentence with too not to.