问题描述: 谁有条件状语从句的用法! 1个回答 分类:英语 2014-09-18 问题解答: 我来补答 连接词主要有 if,unless,as/so long as,on condition that 等if 引导的条件句有真实条件句和非真实条件句两种.非真实条件句已在虚拟语气中阐述.unless = if not.Let's go out for a walk unless you are too tired.If you are not too tied,let's go out for a walk 展开全文阅读