宾语从句分为引导词,语序和时态
1.当从句部分表示陈述语气时,由连词that引导宾语从句,that在句中无词义,不担当句子成分,所以常被省去.
例:I belive (that)he will come tomorrow.
2.当从句表示一种疑问或表示选择时,由连词whether或if引导宾语从句.
例：I want to know whether/if he likes the new house.
3.当从句部分表示特殊疑问句时,有连接代词或副词引导宾语从句.
例：I know where he lives.
二.语序
特点：无论主句是什么句式,宾语从句必须是陈述句语序.
例:Do you know what I mean?
三.时态
1.当主句中的谓语动词是一般现在是的时候,宾语从句可根据需要,选用任何事态.
例：He says he likes biue very much.
2.如果主句中的谓语动词时一般过去式,宾语从句中的谓语动词应用过去的某种时态.
例：Mother said she would go shopping on Saturday.
3.如果宾语从句表示的是客观真理,字眼现象,科学原理等,从句的时态不受主句谓语动词时态的限制,仍用一般现在时.
例：When I was young,I knew the earth moves around the sun.
