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?
there is a famous nava message"Sighted ship, sank same"
okay
Yes you can. Example: Okay, I will go with you.
Yes.
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. There is no English word that cannot end a sentence.
Yes.
Okay, this is my drabbest shirt.
noA sentence cannot end with the word "the". Hmmm, wait a minute.
The word "incidentally" can be used at the end of a sentence. You can make the sentence "This was done incidentally.".
no it doesn't because it is a punctuation not a word
okay here is a sentence: "I don't know what prognostication means!"