We’ll go to the theatre brian doesn’t have to work late

unless
when
if

we’ll go to the theatre if brian doesn’t have to work late

1) was, were

2) was

3) is

4) were

5) are

во всех позициях грамматически можно использовать и отрицательную форму. 

all my new year holidays i celebrated with my family.  after new year celebrating, me and my brother visited all my relatives and congratulated them.  they was very happy about it, and especially my grandmother.  then, i was playing computer games, watching tv and having fun with my friends.  i like winter holidays very much, because i have much time to visit all of my friends.  next time, i hope, that i will be celebrating new year and christmas somewhere in other country.  finland may will be great.