Zero and First Conditional

If we have to work together, we ... cooperate.

• will should

• have to

• should

Unless she ... her results, she ... to the concert.

• improves ... won't go

• improves ... will go

• 1. doesn't improve ... will go

Unless the weather ... better, I ...

• gets ... will arrive

• gets ... won't arrive

• doesn't get ... won't arrive

I won't go to the party unless she ... me

• invites

• doesn't invite

• will invite

If I have to do this, I ...

• do

• will do

• would do