唯有…方能【wéiyǒu…fāngnéng】

唯有…方能 names the single condition under which something can happen: "only by … can", "only if … will". 唯有 means "only", and 方能 is a literary "can only then". Together they are the written counterpart of 只有…才能, at home in essays, speeches, mottos and formal advice.

When the second clause has its own subject, 方能 comes after it.

The two halves can be mixed with their plain equivalents – 唯有…才能 is common – but the full pair keeps one register throughout.

Not with 就

唯有 states the only condition, so its partner is 方能 or 才. 就 belongs with 只要, which states a condition that is enough.

• × 唯有坚持，就能成功 → 唯有坚持，方能成功

The register has to match too. A sentence about everyday plans sounds odd in this frame; use 只有…才.

• × 唯有你陪我，我方能去超市 → 只有你陪我，我才去超市