第十五讲 if条件句
条件状语从句 （conditional sentences）
能够发生或可能发生的事件
If 如果…，那么…
As long as 只要…，就…
Unless …，除非…
标点问题：
If you wanna be cool, follow one simple rule.(当条件状语从句在主句之前的时候往往要加个逗号)
Follow one simple rule if you wanna be cool.(当主句在从句之前的时候，不用加逗号)
\1. If引导真是条件句
①主将从现
从句：if + 主语 + do/does 如果
主句：主语 + will + do 将会
eg:
If you do what you love, money will follow.
②主情从现
从句：if + 主语 + do/does 如果
主句：主语 + must/can 就必须、能够
eg:
If winter comes, can spring be far behind?
③主祈从现
从句：if + 主语 + do/does
主句：祈使句
否定：don’t do/ never
eg:
If you can't say anything nice, don't say anything at all.
In politics, if you want someone to make a speech, ask a man; if you want something done, ask a woman.
If you are ever in trouble, don't try to be brave, just run, runaway.
\2. If引导虚拟条件句
条件句（虚拟条件句）
①想象的情况，假设与现在事实相反
从句：一般过去时/were
主句：would + do
eg:
If I ruled the world, everyday would be the first day of spring.
If I ruled the world, every man would be as free as a bird.
If today were the last day of my life, I would...
雅思口语高频句型
If I were the decision-maker, I would...
If I were the decision-maker, I would fine those who pollute air, water, and land.
②想象的情况，假设与过去事实相反
从句：had done
主句：would have done
eg:
If we had missed that moment, we would have been strangers.
If I had been you, I would not have married me.
should have
could have
would have
eg:
I could've killed you.
\3. 其他条件句
If 如果…，那么…
As long as 只要…，就…
Unless …，除非…
雅思写作高分句:
As long as people stay alert to the negative effects of it, this practice is worth trying.
A country would not develop fast unless it opens to global competition.
雅思口语高频句型:
If possible / necessary , ...
If that's OK / everything could be fine , ...
With.., / Without ...,
Without dreams, life would have no meaning.