為什麼grammar point · tier 1 · 為什麼 — why (for what reason)
· wèishénme
Question word asking for the reason or purpose behind an action or state: why.
字源 FORM what the parts do
為 is a hand (爫) leading an elephant (象) at work, the labour put to a task. Read wèi, the doing turns toward someone, the for of 為了. 什麼 is the borrowed-sound pair for "what"; neither 什 nor 麼 spells it. The two write the for-what slot a reason fills.
故事 STORY a scene to remember it by
An elephant hauls a log from the forest. A hand runs back along the rope, from the moving load to the cause that set it moving.
字源記憶法
框 · Frame
[subj] 為什麼 [verb phrase]？ （為什麼 sits before the verb, in the cause's slot）
觸 · Trigger
You want the reason behind what someone does or how things stand, and you ask them to supply it.
序 · The move
1Build the plain statement of the action or state you are questioning.Is the unknown the reason behind it, not the thing or the person?
2Set 為什麼 after the subject and before the verb, where the cause sits.Did 為什麼 land before the verb, not at the very front like English "why"?
3Read it back; a 因為-clause would answer straight into the same slot.Would "因為…" replace 為什麼 with no other change to the order?
例 · Examples
1你you為什麼why吃不下can't get down (potential complement)飯rice / food？
為什麼 asks the reason (why); 怎麼 asks the manner or means (how), or carries surprise at it. Swap by whether the answer is a cause or a way of doing.
✗ 為什麼你吃不下飯？（acceptable but English-fronted）→ ✓ 你為什麼吃不下飯？
✗ 你因為吃不下飯？（stating a cause where you mean to ask）→ ✓ 你為什麼吃不下飯？
✗ 你什麼吃不下飯？（thing-word where you mean the reason）→ ✓ 你為什麼吃不下飯？
English fronts "why" to the start; Chinese keeps 為什麼 after the subject, in the slot the 因為-answer will take. Learners also reach for 因為 to ask, but 因為 only answers.