什么叫开放式条件句啊.英语方面的

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Open / Present conditional
If clause子句 Main clause主句
-- It refers to an action that is very likely to happen.表示一个发生可能性极高的事情.
If she comes today,I shall tell her the truth.
If the weather is fine tomorrow,we shall continue our journey.
simple present will / shall + bare infinitive
Some more examples of Open/Present Conditional
For general or universal truths,we use simple present tense in both the If-clause and the main clause.这种结构一般用作表达恒常事件,在这情况下,子句或主句皆用现在时态.
If water is heated,it expands.
If the dog sees a stranger,it barks.
In the open conditional,we may use imperative in the main clause when we give advice or a suggestion.在可能实现之条件句中,若我们作出提议时,可在主中使用祈使句.
If you feel sick,go and see the doctor.
If you are in danger,call the police.
We may use 'should' in the if-clause if we are not sure about the possibility.如果我们不能肯定句子的可能性,可在子句中加 'should'.
If Peter should come,call me.通常,我们可采用倒装句写法:Should Peter come,call me.
We may use 'so long as','as long as','even if','even though','provided that','on condition that' in conditional sentences.
I'll lend you the money so long as / as long as (只要)you can pay it back.
Even if / Even though (即使) she had time,she will not visit him.
He will forgive you provided that (只要) you apologize to him.

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