I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

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?

Can you count the number of lines in the below picture?

What is red and smells like blue paint?

Why is the longest human nose just 11 inches?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?