whether
01
是否
used to talk about a doubt or choice when facing two options
例子
He 's trying to figure out whether he should study abroad or stay in his home country.
他正在试图弄清楚是否应该出国留学还是留在自己的国家。
I ca n't decide whether to wear a dress or jeans to the event.
我无法决定是否在活动中穿裙子还是牛仔裤。
02
是否, 如果
used to show an inquiry; if
03
是否, 不管
in any case
