i want to know if your brother （will join） our school trip t

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i want to know if your brother （will join） our school trip to Beijing
括号里为嘛要用将来时?if表示是否的时候必须用将来时?

因为此时的if引导的是宾语从句
宾语从句没有主将从先的原则
只有条件状语从句和时间状语从句才要主将从先
再问：什么是主将从现。。。
再答：就是主句是将来时，从句是一般现在时比如，要是明天不下雨，我们就会去听音乐 if it doesn't tomorrow,we will listen to misic. 我给的例句是状语从句，而你的例句是宾语从句宾语从句，主句是一般现在时，从句用任意时态，就是该什么时态就什么时态，你的从句里要用将来时，因此就用将来时

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