参考书上说on condition（that),provided（that）是conj,可以引导条件状语从句,但是带着括

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参考书上说on condition（that),provided（that）是conj,可以引导条件状语从句,但是带着括号是什么意思
到底on condition that 是连词,还是on condition是连词,还是两个都是连词,求正解,

that 在此处是引导名词性从句,即说明条件是什么（on condition that）,假设是什么（provided that）.有that句子结构比较清晰,容易看懂；不用的话,对英语比较薄弱的同学来说,可能理解起来有些费劲儿,毕竟provide更常用的意思是提供.

THAT可以引导状语从句? 条件状语从句if supposing condition provided区别 Provided (that),Providing (that),suppose,on condition that,i providing (that),provided (that)和on condition (that)的用法 that可以引导状语从句吗 that可以引导原因状语从句吗? provided that 和 on condition that有什么区别? on condition that与provided that的区别? 条件是 on condition that ,on the condition that这两个那个是对的状语从句中supposing/suppose (that) provided/providing (that) cons 【条件状语从句的引导词】中providing that ,supposing that ,given that,prov 参考书上说这句话是unless引导的非真实条件句中的条件从句,可是为什么从句谓语动词不是过去式呢?