Answer:
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
You will find me with four legs, but no hair. People ride me for hours, but I don't go anywhere without needing to be tugged. Jerked or turned on, I always manage to be ready for work.
I have it, I don’t share it. If I share it, I don’t have it. What is it?
A man shot two arrows at its center and missed both times, but using a sword swung once at its center and hit it twice.
I build up castles. I tear down mountains. I make some men blind. I help others to see.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?