I go up and I go down towards the sky and the ground

Question: I go up and I go down,
towards the sky and the ground.
I'm present and past tense too,
Let's go for a ride, me and you.

What am I?

Question: Why did the hen cross the road?

Question: What do you call a sad bird?

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Question: What is the tallest building in the world?

Question: What tastes better than it smells?