第四賓語從句放在句首表示強調時,whether和if的區別 whether和if有什么區別,wherther they can finish the work on time is still a problem.他們是否能準時完成這項工作還是個問題,例如I can't decide whether to stay.我不能決定是否留下來,也只能用whether,例如I want to know whether it's good news or not,