7、heexam②if,whether它们在宾语从句中只起连接作用,不起语法作用,当作是否讲。从句中有ornot结构时,要用whether,如:Iaskhimif(whether)hehashadhislunchIaskshimwhetherhehashadhislunchornot ③ what它在宾语从句中除了作连接词外,还要作主语或宾语成份,如:Idon'tunderstandwhatyousaid(what作said的宾语)。又如:Iaskedhimwhatmadehimsick(what在宾语从句中作主语)。④ who,它也和what一样,在