1. Don't take this job if you don't really want it -> unless... 2. If she does nothing to prepare for the test, she will get bad marks -> unless ... 3. You can't visit the United States unless you get a visa -> If... 4. Unless you remember our address, you can find it in the phone book -> If...

$\text{1.}$ Unless you really want this job, don't take it.

$\text{2.}$ Unless she does something to prepare for the test, she will get bad marks.

$\text{3.}$ If you don't get a visa, you can't visit the United States.

$\text{4.}$ If you don't remember our address, you can find it in the phone book.

$\text{→}$ Unless = If not

$\text{→}$ Câu đk loại 1: $\text{S + will/ can/ may + V<infi> + if + S + V<s,es>}$