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.