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只有 … ，才 … (only if)
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The only way in
- The building door needs a code, and only residents know it.
- only if只有knows知道cipher密码，talent才能to go in进去。 — "Only if you know the code can you get in."
only if只有 A，only then才 B
- only if只有 A，only then才 B = "only if A, (then) B": A is the one and only condition.
- only then才 goes after the subject of the second clause, often with can能 or can / will会.
only if只有a lot多practise练习，only then才can能speak well说好。
Complete: “Only if you rest well will you get better quickly.” 只有好好休息，____能快点好。
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只有 pairs with 才.
Only this person, only this way
- With a person: only if只有he他only then才knows知道the answer答案。 — "Only he knows the answer."
- With a method: only if只有坐飞机，talent才能today今天to / arrive到。 — "Only by flying can we arrive today."
only只有he他(then)才knows知道the answer答案。
Build: “Only he knows the answer.”
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只有 + person + 才 + verb.
only then才, not then就
- Pair only if只有 with only then才: only if只有you你to go去，he他only then才can / will会to go去, not only if只有you你to go去，he他then就can / will会to go去.
- Put only then才 after the subject: he他only then才can / will会to go去, not only then才he他can / will会to go去.
只有你去，他就会去 is the standard pairing.
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只有 pairs with 才: 他才会去.
only if只有…only then才 versus as long as只要…then就
- only if只有 A only then才 B: A is necessary — no A, no B.
- as long as只要 A then就 B: A is enough — easy: as long as只要have有a passport护照，then就can能buy a ticket买票。 — "All you need is a passport to buy a ticket."
as long as只要have有a passport护照，then就can能buy a ticket买票。
“All you need is a student card to get in for free.” Which pair fits? ___有学生证，___能免费进去。
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A student card is enough, so 只要…就….
Recap
- only if只有 A，only then才 B = only if A, B (A is necessary).
- as long as只要 A，then就 B = as long as A, B (A is enough). only if只有 pairs with only then才, as long as只要 with then就.
Read the full reference: HSK 3 grammar — Conditional statements.
The building door needs a code, and only residents know it. Close the examples. Say a Mandarin response, then write it in Chinese. Explain briefly in English what the lesson’s pattern adds. Compare with the model, then change one detail and try again.
This is supported productive practice. Compare meaning and structure; your answer need not copy the model. A partner or teacher must hear the spoken response to comment on pronunciation.