Make the following sentences interrogative and negative 1) about five years

1) About five years ago I met Irene Adler.

Did I meet Irene Adler about five years ago?

I didnt meet Irene Adler about five years ago?

2) I am sure this case is interesting.

Is this case interesting?

I am not sure this case is interesting.

3) It is a real mystery.

Is it a real mystery?

It isnt a real mystery.

4) Such paper is strong and stiff.

Is such paper string and stiff?

Such paper isnt strong and stiff.

5) Our visitor looked at us with surprise.

Did our visitor look at us with surprise?

Our visitor didnt look at us with surprise.

6) I am going to marry.

Am I going to marry?

I am not going to marry.

7) You can find me at my place.

Where can you find me?

You cant find me at my place.