定语从句引导词即连词中没有what.有that,who,which,whose,whom,where等.

　　1当先行词为人时用who或that.如：Heisthemanthat/wholikesplayingbasketball.

　　2当先行词为物时用which或that.如：Thebookwhich/thatIboughtyestedayisveryinteresting.

　　总之,what引导的是宾语从句而不是定语从句.如：Idon'tknowwhatIshoulddonext.