There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

What always comes into a house through the keyhole?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?

You bought me for dinner but never eat me. What am I?

How can you make a TV, a bed, a dog, and a car liquid?

Which alphabet is a part of our body?

Why do Chinese men eat more rice than Japanese men do ?

Which country gets ill every time?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

I cannot talk, but I always reply when spoken to. What am I?