一.宾语从句的定义置于动词、介词等词性后面起宾语作用的从句叫宾语从句。宾语从句的语序必须是陈述语序。谓语动词、介词、动词不定式，形式后面都能带宾语从句。有些形容词（afraid,sure,glad 等）之后也可以带宾语从句。二.宾语从句中引导词的用法在复合句中作主句的宾语，引导词有：连词：that (that 常可省略),whether, if代词：who, whose, what ,which副词：when ,where, how, why 等。（一）that 引导的宾语从句（在非正式场合 that 可以省略）可跟 that 从句做宾语的动词有：say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report 等。例句：The boy believes that he will travel through space to other planets.注意事项：当主句谓语动词是 think, believe, suppose, expect 等词，而宾语从句的意思是否定时，常把否定转移至主句表示。例句：I don’t think it is right for him to treat you like that.在以下情况中 that 不能省略1.当句中的动词后接多于两个由 that 引导的宾语从句时，第一个 that 可省，但后面的 that 不可省。例句：He said (that) you were too young to understand the matter and that he was asked not to tell you.2.当主句的谓语动词与 that 宾语从句之间有插入语时，that 一般不可省。例句：Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.3.当 that 从句是双宾语中的直接宾语时，that 不可省。例句：I can’t tell him that his mother died.注意事项：许多带复合宾语的句子，that 引导的宾语从句常常移到句子后部，而用 it 作形式宾语。例句：I find it necessary that we should do the homework on time.（二）由 whether,if 引导的宾语从句由 whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来，在宾语从句中 whether 与 if 可以互换使用，但在特别情况下 if 与whether 是不能互换的。例句：I wonder...
