5. If the bus doesn't arrive on time, we’ll miss the beginning of the film.

6. How about going to the cinema tonight?

7. I haven't seen an American romance for 3 months.

8. Although the plot wasn’t very interesting, the special effects were spectacular.

5. Unless the bus arrives on time, we’ll miss the beginning of the film.
 If the bus doesn't arrive on time, we'll....
6. Let’s go to the cinema tonight.
 How about going to the cinema tonight?
7. The last time I saw an American romance was three months ago.
 I haven’t seen an American romance for 3 months
8. The plot wasn’t very interesting, but the special effects were spectacular.
 Although  the plot...., the special....