Answer:
If you have me, you want to tell me. If you tell me, you don't have me.
What's always coming, but never arrives?
A mechanism to discover who is following you.
In spring I look gay, Covered in a green array, The warmer it gets the more clothing I wear, As the cold grows, I throw away my clothes.
What comes one time in today, three times in tomorrow and never in the future?
I am a room that has a roof but no walls. What am I?