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

What Word am I Looking For ?

A cat, a dog and a monkey were stolen. 3 suspects got caught: Harish, Manoj and Tarun. All we know is each person stole one animal, but we do not know who stole which. Here are the investigation statements. Harish said: Tarun stole the cat. Manoj said: Tarun stole the dog. Tarun said: They both were lying. I did not steal the cat or the dog. Later on, the police found out the man who stole the monkey told a lie. The man who stole the cat told the truth. Can you find out who stole which?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

Why is the Hole below a Lock?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

How do you go from 98 to 720 using just one letter?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13