1、"only when" 在句子中出现,句子则被视为条件状语蒉翟蛳庹从句,此时"only when"翻译为"只有在...的时候"。用法举例:I will be happy only when I see you. (只有看到你我才会快乐)You can join the group only when you pass the test. (只有通过测试才能加入群体)I will go to bed only when I finish my work. (只有完成工作才会去睡觉)
2、而且,"only when" 常用于条件状语从句中,连接主句和条件句,通常在条件句中出现。补充,为什么不用“when”,如果只用"when" 则会变成一般将来时的意思。I will be happy when I see you. (看到你我就会快乐)所以,条件状语从句使用"only when"