第四宾语从句放在句首表示强调时,whether和if的区别 whether和if有什么区别,wherther they can finish the work on time is still a problem.他们是否能准时完成这项工作还是个问题,例如I can't decide whether to stay.我不能决定是否留下来,也只能用whether,例如I want to know whether it's good news or not,