1. I don't get my work finished, I can't go with you

2. Peter's father doesn't tell him what to do, he will never do anything

3. you really want this job, don't take it

4. she does something to prepare for the test, she will get bad marks

5. you don't get a visa, you can't visit the US

1 I can't go with you unless I get my work finished.

-> If I get my work finished, I can go with you.

2 Peter never does anything unless his father tells him what to do.

-> If Peter's father tells him what to do, he will do something.

3. Don't take this job if you don't really want it.

-> Unless you really want this job, don't take this job

4 If she does nothing to prepare for the test, she will get bad marks.

-> Unless she does something to prepare for the test, she will get bad marks.

5 You can't visit the United States unless you get a visa.

-> If you get a visa, you can visit the United States