Use a superlative :

    Ex : "This exercise is very difficult : it's the most difficult exercise" (I've ever done !)
   ( Construction à respecter dans la réponse => adjectif au superlatif + nom )

1- It was a very happy day : it was in my life.
2- It's a very good book : it is I've ever read.
3- He's a very famous singer : he's certainly in the country.
4- I know it was a bad mistake : it was I had ever done.
5- She's a very pretty girl : she's of the class.
6- It was a very cold winter : it was we had ever known.
7- Jack is a boring man : he's I've ever met.
8- Alice is really a funny child : she is in the family.