Unless is used to indicate an exception or condition that must be met, similar to if not. Unless a new theory emerges, our abilities will continue to be measured with IQ and EQ tests. Both unless and if not can be used to convey a positive or negative result in a sentence. Some people have achieved extraordinary successes despite not having high IQ scores.

1. Ifnothasthesamemeaning as unless. Unless a newtheory emerges, ourabilitieswill continue to bemeasuredwith IQ and EQ tests. = If a newtheorydoes notemerge, ourabilitieswill continue to bemeasuredwith IQ and EQ tests.

2. Ifyoudon´ttake na IQ test, thecompanywon´t consideryour application. Unlessyoutakena IQ test, thecompanywon´t consideryour application.

3. Theresult in a sentencewithunlesscanbeboth positive ornegative. We´llgo to thebeachtomorrowunlessit rains. Wewon´tgo to thebeachtomorrowunlessit´s sunny.

4. Some peoplehaveachievedextraordinarysuccesses, eventhoughthedon´t havehigh IQS. Some peoplehaveachievedextraordinarysuccesses. Nevertheless,theydon´t havehighIQs.