例句：Whether she will come or not is still a question.
這裏有一個引導詞whether，所以Whether she will come or not這部分是從句。
而這部分在句子裏是主語，句子的謂語是is，表語是still a question
whether位於句首引導主語從句。例句：The jury is out on whether or not this is true.這是否屬實尚無定論。It remains to be seen whether his project will fly.他的計劃能否成功尚需拭目以待
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