什么叫开放式条件句啊。英语方面的

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