B1 (used especially in reporting questions and expressing doubts) if, or not(尤用於轉述問題或表達疑問)是否
B1 (used to introduce two or more possibilities) it is not important if(用於引出兩種或多種可能性)不管…還是…;或者…或者…
More examples
He called for checks to discover whether corrupt officials are being bribed to connive in shoddy construction.
The authorities debated whether to build a new car park.
We need to consider whether the disadvantages of the plan outweigh the advantages.
She asked the man sitting opposite whether he'd mind if she opened the window.
She doubts whether she'll ever be able to fulfil her ambition.
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