с условными
b. I (not go) to the football match next week ___ Beckham (not play).

I wouldn't ring you if I was late.

I won't ring you if I am late.

I won't go to the football match next week if Beckham doesn't play.

Conditional 1,

Условие тут "если не" :

I won't ring you, unless I am late.

Conditional 1

I won't go to the football match if Beckham isn't playing.