“It's official: I'm moving to the U.S.!”
You've been planning on moving to the United States. You needed to find a job and get a visa to move there. You've finally done that, so you make this announcement on Twitter.
It's official: I'm moving to the U.S.!
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When you're talking or writing about the United States, the most common and natural way to refer to the country is to say "the U.S.". This is much more common than calling it "U.S.A." or "the United States".
Notice that you always have "the" in front of "U.S.".
(someone) is (doing something)
You can use "I'm ___ing" to talk about things that are in the middle of happening now:
I'm waiting for the bus.
...or about things that are going to happen soon in the future:
I'm moving to Sweden in March.
People usually talk about the future this way when they're discussing plans that have already been set or chosen.
It's official: (sentence)
Use this phrase to announce a decision that is now ready to be shared with the public.
An "official" decision is final. It has been confirmed by someone with authority. For example, if you marry someone, the marriage is "official" when you complete all of your marriage paperwork with the government, or when you complete your wedding ceremony.
Recently, more and more people have started to use "it's official" to talk about things that are only their own personal opinion. For example:
It's official: Burger King is the worst restaurant in the world.