Conditional complex sentence “只要……，就……”
In the Chinese pattern “只要……，就……” (zhǐyào..., jiù...) the part after “只要” names a condition that is enough for the result to follow.
That is, once that condition holds, the result after “就” follows.
Basic Structure
只要 + condition，+ 就 + result
In English:
As long as …, …
or
If only …, then …
Key Rule
The subject can stand either before “只要” or after it.
Subject + 只要 + condition，+ 就 + result
or
只要 + subject + condition，+ 就 + result
If the two clauses have different subjects, the second one comes before “就”.
只要 + subject₁ + condition，+ subject₂ + 就 + result
Examples
我只要几天不跟他视频，就很想他。
If I go just a few days without a video call with him, I miss him a lot.
Structure
我 + 只要 + 几天不跟他视频，+ 就 + 很想他
I + as long as + go a few days without a video call with him + then + miss him a lot
我 — I
只要 — as long as
几天不跟他视频 — to go a few days without a video call with him
就 — then
很想他 — to miss him a lot
只要你同意，我们就这么决定了。
As long as you agree, that's what we'll decide.
Structure
只要 + 你同意，+ 我们 + 就 + 这么决定了
as long as + you agree + we + then + will decide it this way
只要你同意 — as long as you agree
我们 — we
就 — then
这么决定了 — will settle on it
The two clauses have different subjects here — 你 ≠ 我们 — so the second subject 我们 comes before 就.
只要你坚持每天早睡，身体就一定会好起来。
As long as you keep going to bed early every day, your health is sure to improve.
Structure
只要 + 你坚持每天早睡，+ 身体 + 就 + 一定会好起来
as long as + you keep going to bed early every day + your health + then + is sure to improve
只要 — as long as
你坚持每天早睡 — you keep going to bed early every day
身体 — the body / one's health
就 — then
一定会好起来 — is sure to get better
Quick Rule
只要 + condition，+ 就 + result
Meaning: the first clause names a condition sufficient for the result. Given that condition, the result in the second clause follows.
Examples:
我只要几天不跟他视频，就很想他。
If I go a few days without a video call with him, I miss him a lot.
只要你同意，我们就这么决定了。
As long as you agree, that's what we'll decide.
只要你坚持每天早睡，身体就一定会好起来。
As long as you keep going to bed early, your health is sure to improve.