7、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,在句中除作连接词外,可以充当句中的成份,如:Iknowwhoshei