The book that I read last week was not half as interesting as the new one that I am reading now.
The boy who has won the last match is new in this neighbourhood.
En frases
condicionales no se coloca una coma, si
la frase principal está al principio
de la frase. Si la frase principal esta al
final de la frase, se puede omitir la coma.
We would have been rich now if you had won the lottery.
If you had won the lottery(,) we would have been rich now.