（也/那/這）就是說 — Restates the clause just made as its plain equivalent or upshot: the same fact said again, so that is to say.

grammar → （也/那/這）就是說

TSUMUGU · TBCL 4 (est.) · 語法

（也/那/這）就是說 grammar point · tier 1 · restatement 就是說 (in other words / that is to say)

Restates the clause just made as its plain equivalent or upshot: the same fact said again, so that is to say.

字源 FORM what the parts do

就 climbs to the high place and arrives — its 就是 branch means it amounts to exactly this. 是 says it is so; 說 lays the words open (言 beside 兌 for sound). Together 就是說 settles the next clause as exactly the same fact, re-said. The bracketed 那/這 point back at what was just spoken, 也 ties it on; all three are optional, 就是說 is the fixed spine.

故事 STORY a scene to remember it by

A claim is set down, and beside it the same claim laid out in plainer words; two faces of one fact, nothing new added.

字源記憶法

框 · Frame

[statement]，（也/那/這）就是說，[same fact re-rendered plainly]

觸 · Trigger

You have stated something and want to re-render it as its plain meaning or upshot, the same fact in clearer terms.

序 · The move

1state the first clause in fullis there a fact already on the table for the restatement to re-render?

2open the second clause with 就是說 (optionally 也／那／這 in front)does the spine 就是說 sit intact, with 那/這 only pointing back at what was said?

3re-render the same fact plainly or as its upshotis the second clause the same fact re-said, not a new and separate fact?

例 · Examples

1氣象報告weather report說週末weekend會有颱風typhoon，也／那／這就是說which is to say / in other words，我們不能去海邊seaside, the beach了marks the new state (now we can't)。

The weather report says there'll be a typhoon this weekend, which is to say, we can't go to the beach.

界 · Boundary

因為…所以…

就是說 re-renders one fact as its own plain equivalent (the two sides name the same thing). 因為…所以… links two distinct facts, a cause to its separate effect. One says it again; the other moves from one fact to another.

也就是

也就是 equates two terms or labels inside a clause (X，也就是 Y — X, namely Y). 就是說 reformulates a whole clause into another whole clause. Naming a thing against re-saying a statement.

introducing a brand-new fact instead of a restatement: 會有颱風，就是說我帶了傘 → 會有颱風，就是說我們不能去海邊了

breaking the spine: 也就說我們不能去 → 也就是說我們不能去

using it for cause→effect with two separate facts: 下雨了，就是說地很濕 (treated as cause/result) → 下雨了，所以地很濕

English 'that is to say / in other words' drops in freely; learners render it word-for-word and lose the fixed 就是說 spine, or stretch it to mean 'and so / therefore' where two distinct facts call for 所以。