There is one mistake in each of these sentences. Find them and correct them

There is one mistake in each of these sentences. Find them and correct them.
1. A friendship is important to me
2. Look, Sarah! I've just bought the new computer.
3. A book you sent me is very informative.
4. The money cannot buy happiness.
5. The weather was lovely so we went to beach.
6. I prefer playing computer games to playing the soccer.