no
Yes. An example is below. In today's world, cell phones are everywhere.
No, you cannot start a sentence with "no" unless you need to do so. No reason exists not to start a sentence with that word, as you can see. No one will care if you do start a sentence with it.
Yes, I can start a sentence with "Is."
Two thousand and fourteen was the centenary of the start of the First World War.
Yes, you can start a sentence with a verb.
Yes, you can start a sentence with an acronym.
You can start a sentence with "Also"
You start a sentence with whatever word you need to start it with. A sentence can start with "A" if it needs to. A sentence just needs to make sense.
No because it is informal. You can't start a proper sentence with U.S. without the word The. For example, U.S. is the third largest nation in the world. However if U.S. is used as an adjective it can be. For example, U.S. troops are the best soldiers in the world.
i start all of my letters with a good salutation like good morning.
Yes you can! "For ten long years, I pondered how to start a sentence with 'for'."
can you start a sentence using the word phishing?