什么情况下只能用that引导从句
问题描述：
什么情况下只能用that引导从句
答
只能用that作关系代词的情况：
1在不定代词anything,nothing,theone,all,much,any,few,little等作先行词指物时
Isthereanythingthatyoudon’tunderstand?
2先行词有theonly,thevery修饰物时
ThisistheonlybookthatIwant.
3先行词为形容词*时
Thiswasthemosttouchingmovieofthisyearthatmadenumerouspeoplecry.
4先行词既有人又有物时
Forhoursweweretalkingaboutthepeopleandplacesthatinterestedus.
5为避免用词的重复
Whoisthemanthatismakingaspeechtothestudents?
6先行词前有序数词或thelast修饰时
Thisisthefirstnovel(that)Ihaveread.
Goingtothetheatreisthelastthing(that)Iwanttodo.
7关系代词在定语从句中充当表语的成分
Heisnotthemanthatheusedtobe.