①定语从句所修饰的词,同时又被形容词最高级修饰时,定语从句只能用that引导;
This is the most interesting story (that) I have ever heard.
②定语从句所修饰的词,同时又被序数词修饰时,定语从句只能用that引导;、
The children like the second Lesson that is about “The Football March”.
③定语从句所修饰的词,同时又被the only,the very或the same修饰时,定语从句只能用that引导;
1) It is the only word (that) I know in the passage.
2) This is the same bicycle (that) I lost.
定语从句修饰的词同时又被不定代词,如:all,any,no,every,little,many或much等修饰时,定语从句只能用that引导;
Here is all the money (that) I have.
⑤定语从句修饰词为everything,something,anything,nothing,all,none,much,little,few等不定代词时,定语从句只能用that引导。但something前有the时,定语从句可由which引出。
Here is something (that) I will tell you.
I want everything (that) I want.
⑥定语从句修饰的词中同时含有“人”和“物”的名词时,定语从句只能用that引导:
I can remember well the persons and some picture (that) I see in the room.
⑦定语从句修饰的词为one, ones时,定语从句用that引导:
Is it the one (that) you want?
⑧当主句的主语是疑问词 who或 which来提问时,为了避免重复,用that引导定语从句:]
Who is the girl that won the first place?