Rewrite the sentences

1 . There will be a shortage of water unless it rains .
If.... 
2 . Unless you study harder , you won't pass the final exam .
If.... 
3 . Unless this biodiversity werewere maintained , marine life would be at stake .
If.... 
4 . My teacher speaks to quickly . I can't understand her explanation .
If.... 
 5 . I drink to much strong coffee , that's why I can't sleep .
If.... 
6 . The weather is not fine , that's why I can't sleep .
If....
7 . They felt tired because the meeting was long .
If.... 
8 . He couldn't do that exercise because he didn't learn his lesson carefully 
If... 
9 . John was ill , so he didn't go to the party .
If.... 
10 . I don't know Mai's address , so I can't come to see her .
If.... 
11 . If she doesn't come here immediately , I will omit her name out of list 
Unless....