1. Nga didn't go to school because she was ill

2. If you late again, you will lost your job

3.Unless she hungry, she will miss the train

4. I broke the cup because I was careless

5.that forest is where they are living and working 

6.as the raning heavily outside, we were postponed the picnic

7.if the weather is fine, we will take the photographs

8.she went to bed early because she was tired last night

1, nga didn't go to school.she wasill.(because)

=> Nga didn't ... because she was...
2, you willl lose your job. you  are  late  again(if)

=> you will.... if you are...
3, if she donsen't hurry , she  will miss  the train  ( unless)

=> she will... unless she hurrry
4, i was careless , I broke the cup (because)

=> i broke .... because i was...
5, that is forest . they are living  and working in the forest ( where)

=> that is the forest wher they are living and working in 
6, it  was  raning  heavily outside . we  postponed  the  picnic (as)

=> we postponed... as it was ...
7, the weather is  not  fine . we won't take  photographs( if)

=> if the weather were fine, we would take....
8, she went to bed early .she  was tired last  night (because)

=> she went ... because she was...