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Ifitisfinetomorrow,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.Ifitdoesn'traintomorrow,therewillbeasportsmeetinourschool.2.Youwillmissthetrainunlessyousetoutatonce.

　　在由when,before,after,assoonas,once,till/untill引导的时间状语从句中,如：1.Whenyoumeetanewword,youmaylookitupinyourdictionary.2.WhenyouarriveinLondonat8tomorrowmorning,itwillbe4o'clockinBejingintheafternoon.3.YouwillhavetogeteverythingreadyforthepartybeforeIcomethisevening.4.Afteryoufinishreadingthewholebook,youwillbeabletoknowitsrealmeaning.5.I'llwritetoyouassoonasIgetthere.6.Onceyouunderstanditsmeaning,youwilleasilyremembertheword.7.I'llnotleavehereuntil/tillhecomesback.

　　在由as/solongas（只要……）引导的条件的状语从句中,如：

　　Itishardtoavoidmistakes,as/solongasyoucorrectthemconscientiously,itwillbeallright.