well,write a new sentence with the same meaning.use unless in your sentence
eg: you must try a bit harder or you will fail in the exam
لما نديرو unless على الجملة ترجع هكذا
unless you try a bit harder,you will fail in the exam
او
you will fail in the exam unless you try a bit harder
eg: you have to speak very slowly or you will not be understood
ترجع هكذا
unless you speak very slowly,you will not be understood
او
you will not be understood unless you speak very slowly
eg:business must improve soon or the company will have to close
ترجع هكذا
unless business improves soon,the company will have to close
او
the company will have to close unless business improves soon
best of luck