青衣 刘嘉楠:如何用现在时表示将来时

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。

一、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.

二、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.

三、在由as/so long as（只要……）引导的条件的状语从句中，如：

1.It is hard to avoid mistakes, as/so long as you correct them conscientiously, it will be all right.

2. so long as one inch of this deck remains above water, here is ho

主将从现的从句就是用现在时表示将来时

will do变为be+doing
比如：Sam will go to London tonight.变为Sam is going to London tonight.
不过不是所有的动词都能用-ing形式来表示将来的