名词性从句:
主语从句:1.时态不受主句影响 2.从句做主语同ing做主语一样,主句谓语动词(一般情况下)需用单数[特例:what we need are good doctors.但是特例极少!慎用复数!] 3.关系词有that,whether,who,what,whatever等,连词位于句首不能省略 4.常用it作形式主语,真正的主语从句在后面,形为It+形式主语谓语+从句,单数形式。(注意区别强调句)
表语从句:跟在系动词(be动词,感官动词see hear taste touch等,grow become等)后的从句。1.连接词:that,what(ever),who(ever),when,where,which,why,whether,how,because, as if, as though,不可省。(注意区分that is why和that is because的意思) 2.表从必须为陈述语序。 3.时态不受主句影响
宾语从句:1.动宾名定:先行词为一般谓语动词则后面为宾从,为名词或代词则后面为定从
2.宾从引导词最好不要省略 3.用whether之类的介词宾语从句:We are talking about whether we admit students into our club. 4.It作形式宾语
同位语从句:1.与状语从句区别:同从只是用来解释先行词,状从是用来补充;同从中,先行词在从句中不做成份,状从中先行词在从句中一定需要承担成分 2.与定从区别:定从修饰名词或代词,同从只能修饰名词。同从可以不紧跟在先行词后。 3.引导词that whether what who whom whose when where how why,that一定不可省