只要就 as long as：
只要你有问题，我就会出现。As long as you have a question, I will show up.
只有才 only if:
只有努力的人，才会成功。Only if you work hard can you succeed.
You can succeed only if you work hard.
仅当 only when:
仅当你有目标时，生活才有意义。Only when you have goals, life is meaningful.
