同位语从句一定要用that 吗

题目

同位语从句一定要用that 吗

答案

不一定,有可能用whether,具体看语句的意思,同位语从句常放在fact,news,idea,truth,hope,problem,information等名词后面,说明该名词的具体内容,给你几个具体的用that或者whether的例子,自己体会下吧.你也可以去找些语法书来更系统的研究下.
　　1.如同位语从句意义完整,应用that引导同位语从句.
　　例：The general gave the order that the soldiers should cross the river at once.将军下达了战士们立即过河的命令.
　　2.如同位语从句意义不完整,需增加"是否"的含义,应用whether引导同位语从句.
　　例：We'll discuss the problem whether the sports meeting will be held on time.我们将讨论运动会是否会如期举行的问题.
　　3.如同位语从句意义不完整,需增加"什么时候"、"什么地点"、"什么方式"等含义,应用when,where,how等词引导同位语从句.
　　例1：I have no idea when he will be back.
　　例2：I have no impression how he went home,perhaps by bike.