疑問句加咗かどうか之後點解唔可以再加か？

Question

「行くかどうか分かりません」呢句，我一開始寫咗「行くかどうかか分かりません」，老師話錯。かどうか本身唔係已經包含咗個「か」咩，點解淨係識分開嚟諗？

Accepted Answer

かどうか is a fixed, fused expression meaning 'whether or not' — it's already a complete grammatical unit built from か (question marker) + どう (how) + か (question marker again), but historically fused into one indivisible phrase. You just attach it directly to the plain form of the verb/adjective and stop there: 行くかどうか, 高いかどうか, 好きかどうか. Adding another か on top would be redundant/ungrammatical, like adding a second question mark in English. Just memorize かどうか as one block meaning 'whether'.