Using 'what' as the subject of a sentence

The use of 'what' as the subject of a sentence can add variety to the sentence structures we use in our writing. The following are some examples of how 'what' can be used as the subject of a sentence:
1 What surprised me was the man who suddenly appeared in front of me out of nowhere as I had not seen him before.
2 What you told him is not the truth.
3 What appeared to be a good day turned out to be an bad one.
4 What attracted me to buy the book was its cover.
5 What you are reading now is a post in my blog.
6 What we do every day is a routine.
7 What prompted him to scold me was my bad behaviour.
8 What happened to him is not my concern.
9 What you hope to achieve will be realised some day.
10 What to write in this blog is something I have to think of every day.