Answer:
A time when they're green. A time when they're brown. But both of these times, cause me to frown. But just in between, for a very short while. They're perfect and yellow. And cause me to smile.
You should keep it as straight as can be, yet very few do. Most of the time it's slightly bent or curved. Your sadness usually causes it to bend further, but don’t bend it for too long or it may never be able to fully straighten out again. What is it?
Goes over all the hills and hollows. Bites hard, but never swallows.
You heard me before, yet you hear me again, then I die. Until you call me again.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
What language does a billboard speak?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?