What is the next number in this matchsticks series riddle?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Prove that the below maths equation is true.

8 + 8 = 91

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

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

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