everyone needs friends
Both are correct: Everyone needs friends. Everyone needs friends!
did you like the sound therapy yesterday
Did you like the sound therapy yesterday?
are you tired
Are you tired?
what is your favorite fruit
What is your favorite fruit?
is he tall
Is he tall?
you should exercise everyday
You should exercise everyday.
what time is it
What time is it?
today was the best day of my life
Today was the best day of my life!
i am happy today
Both are correct: I am happy today. I am happy today!
where are you
Where are you?