你看错了吧，在when和if引导的从句里，恰恰应该用现在时表将来。 你看If it is fine tomorrow，不正是用现在时表将来吗？
中学英语中，有些从句只能用一般现在时形式表示一般将来时，现归纳如下，以供参考。
在由if,unless引导的条件状语从句中，如：1。 If it doesn't rain tomorrow, there will be a sports meet in our school。 2。You will miss the train unless you set out at once。
在由when,before,after,as soon as,once,till/untill引导的时间状语从句中，如：1。When you meet a new word,you may look it up in your dictionary。
2。When you arrive in London at 8 tomorrow morning, it will be 4 o'clock in Bejing in the afternoon。 3。You will have to get everything ready for the party before I come this evening。
4。 After you finish reading the whole book, you will be able to know its real meaning。 5。I'll write to you as soon as I get there。
6。Once you understand its meaning, you will easily remember the word。 7。I'll not leave here until/till he comes back。
在由as/so long as（只要……）引导的条件的状语从句中，如：
It is hard to avoid mistakes, as/so long as you correct them conscientiously, it will be all right。
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