We know (that)he is lying.定语从句 相当于一个 形容词 ,但因为是句子,所以只能放在所修饰词的 后面 。常用的引导词为:关系代词:who(主语或宾语),whom(宾语)whose(定语 )关系副词:when(时间),where(地点),why(原因),that(人或物,作主语或宾语),which(指物 ,作主或宾)如:This ...
【which引导】I don't know which dress you want to buy.我不知道你要买哪条裙子。
I don't know when they will arrive in Beijing.我不知道他们什么时候到达北京。
【whether/if引导】I wonder if / whether I can go with you.我想知道我能不能和你一起去。【what引导】I want to know what book you like to read.我想知道你喜欢读什么书。【which引导】I don't know which dress you want to buy.我不知道你要买哪条裙子。
宾语从句:(that常可省略)1.用that引导: I'm sure (that) she will come.2.用whether/if引导:表"是否"(但if不可放在句当"是否")I don't know whether it will be fine tomorrow.3.用疑问词引导(what,when,where,which,how,who,whose,why):He didn't understand why they were laughing....