There is something which is always coming but never arrives?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Akbar summoned Birbal out of anger.
He told him that he will have to face death.
He asked him to make a statement and if the statement is true he will be buried alive and if the statement is false, he will be thrown at lions.
After hearing Birbal’s statement, Akbar could do nothing but smile.
He gave him 5 gold bars and let him go.

What did Birbal say?

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

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

What Word am I Looking For ?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?