✔ 最佳答案
We only use IF at the beginning :
IF I can't meet the bus at 7:30 a.m., I will be late.
IF I won the prize, I would give it to my Mum.
如果你想擺 if 中間 就用whether
Whether 有"其一"的意思如:
we should go home whether by bus or train.
即是不是搭"公共汽車"便是答"公共汽車"回家, 二取之其一
whether當然可以有第二種使用方式
i don't know whether she is coming
但這句表示了"她來"及 "她不來"的結果, 她只會來或不來, 也是二中其一