9
![English Language Learners](//cdn.sstatic.net/Sites/ell/Img/apple-touch-icon.png)
Let's look at simpler example -
Try to finish at least 10 chapters from that book, if not all.
This means if all chapters are not possible, try to finish at least 10.
That smell (from a rotten thing) can cause nausea, if not vomiting
This means that that smell is likely to cause vomi...