Up Down Past Present

Riddle: It goes up, but at the same time goes down. Up toward the sky, and down toward the ground. It's present tense and past tense too, come for a ride, just me and you. What is it?

Answer: A See-Saw.

Source: https://www.riddles.com/265

It goes up, but at the same time goes down. Up toward the sky, and down toward the ground. It's present tense and past tense too, come for a ride, just me and you. What is it? — Up Down Past Present by Anonymous v1.

Riddle: It goes up, but at the same time goes down. Up toward the sky, and down toward the ground. It's present tense and past tense too, come for a ride, just me and you. What is it? Answer: A See-Saw. — by Anonymous v2.