yes
No, it's an interrogative sentence, meaning, it asks a question. Declarative sentences make a statement: The movie starts at 4:30. The scissors are on the kitchen table. The cat has pooped on the stairs.
It's just like saying: This is a 2 Pack soda, instead of this is a 2 Packs soda. If you're using it as a name, it's not plural. Whereas, if I was to say: I bought 2 packs of soda, it would be grammatically correct. It depends how you use the warning in a sentence. This is how you would rephrase that depending on your sentence: Class, this is your 2 minute warning - VS - Class, this is a warning that you have 2 minutes left, or Class, I'm warning you that you have 2 minutes left. It all depends on how you say it...I know how you feel, American grammar!!! Am I right?
how did the movie start?
The correct answer is January 1, 1991.
The beginning
it IS physically possible, but not grammatically correct.
Yes, but it would not be grammatically correct.
Yes, as in: "Will it snow in December?"
It certainly can be: Well phrased ideas are appealing.
Yes. However hard you work, I am still not paying you more.
Yes, it is grammatically correct; when used, it is followed by a comma. However, it is often overused in writing and shouldn't be used in excess.
Yes. There is no word that cannot begin an English sentence. But that does not mean that it is always a good way to begin one.
The correct sentence form is: Abby whispered, "The movie is about to start."
There are scenarios in which it is possible to start a sentence with the word "while," and still be grammatically correct. It may be used in statements that highlight simultaneous action.
Yes, you could. It may or may not be grammatically correct, but lots of people do it both in conversation and in writing.
LeastDuck, as you are a grrreat fan of deleting other people´s answer, try your own medicine. Like it, Ducky?
No, not usually, because normally it is grammatically incorrect.