只要⋯⋯就⋯⋯
zhǐ yào …… jiù ……
Expressing "as long as" with "zhiyao"
只要…就… gives a sufficient condition — that's all it takes.
只要 + Condition，就 + Result
How it works
只要你过来，我们就很开心 — as long as you come, we're happy. Nothing more is required.
Contrast with 只有…才…, which gives a necessary condition: nothing else will do.
The 就 in the second clause is obligatory.
Examples
zhǐ yào nǐ guò lái, wǒ men jiù hěn kāi xīn
只要你过来，我们就很开心。
As long as you come, we'll be happy.
zhǐ yào nǔ lì, jiù yí dìng néng chéng gōng
只要努力，就一定能成功。
As long as you work hard, you're bound to succeed.
zhǐ yào bú xià yǔ, wǒ men jiù qù
只要不下雨，我们就去。
As long as it doesn't rain, we'll go.