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.
What word in the English language does the following: the first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?
Pregnant every time you see her, yet she never will give birth.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breath on this terrestrial ball.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.