事實上grammar point · tier 1 · 事實上 — in fact, as a matter of fact (what the facts show)
· shìshíshàng
adv — sets aside what was assumed or popularly held and plants the sentence on what the facts actually show.
字源 FORM what the parts do
事 is a hand gripping a tally-staff, the matter on record; 實 is a roof (宀) over strings of cowries (貫), a house filled solid — together 事實, the matter as it solidly stands, the facts. 上 is a short stroke above the ground line, on top of. The three together stand the sentence on the recorded facts.
故事 STORY a scene to remember it by
A claim floats up like mist; a foot comes down on the bare stone underneath and stays there.
字源自撰記憶法
框 · Frame
[assumed / popular claim] ， 事實上 ， [what the facts show].
觸 · Trigger
A widely-held belief is on the table and you overturn it with the evidence.
序 · The move
1State the assumption or common belief first — what people take to be so.Is there a claim for 事實上 to stand against? With nothing assumed it has no ground to correct.
2Open the next clause with 事實上, then deliver what the facts show.事實上 leads the clause, comma-set; it is a sentence adverbial, never sentence-final.
3Make the factual case genuinely overturn the belief, not merely add to it.If the second clause agrees with the first, 事實上 is empty; it earns its place by contradicting.
例 · Examples
1一般人ordinary people, most people認為think, hold that運動exercise一定可以is sure to be able to減肥lose weight，事實上in fact / as a matter of fact，飲食控制diet control才是is the one that (emphatic)最重要的the most important。
People generally think exercise is sure to make you lose weight; in fact, diet control is what matters most.
其實 corrects a personal impression in plain talk. 事實上 names 事實 — the facts, the evidence — and overturns an assumption with what the record shows; it is the heavier, more written choice and weighs a public belief against proof.
實際上 stresses the practical reality versus theory or appearance ('in practice it works out as…'). 事實上 stresses the factual record versus a held belief ('the facts are…'). Near-twins; 事 fixes 事實上 on stated facts, 際 fixes 實際上 on how things actually play out.
✗ 飲食控制才是最重要的事實上。 → ✓ 事實上，飲食控制才是最重要的。 (事實上 leads the clause, not sentence-final.)
✗ 事實上，飲食控制很重要。(no belief to overturn) → ✓ 一般人認為運動才能減肥，事實上飲食控制更重要。
✗ 我事實上是學生。(flat fact) → ✓ 大家以為我在工作，事實上我還是學生。(overturns an assumption)
English 'in fact' often just intensifies or elaborates an agreeing point ('I like it; in fact, I love it'). 事實上 needs a belief it contradicts; using it to pile on agreement reads as correcting something no one claimed.