What has one letter and starts with an E?

What breaks yet never falls, and what falls yet never breaks?

What is the riddle which can be asked all day with a different correct answer each time.

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Which is the correct shadow of the bird?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

What has many keys but can’t open a single lock?

Why 1729 is a magic number? Answer Logically.

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months