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表语从句是指用来作为主语或者宾语补足语的从句,它与主句之间需要通过连接词来进行连接。在英语中,表语从句的连接词有三种:that、whether和as if/though。
that
that是表语从句最常见的连接词,用来引导陈述句和命令句。例如:
- My belief is that he will come back.
- She insists that we go to the party together.
- The doctor ordered that he should rest at home.
在以上的例子中,that连接词引导了陈述句和命令句中的表语从句,使其与主句进行连接。
whether
whether是表语从句的连接词,用来引导疑问句和选择句。例如:
- I don't know whether he will come back.
- Whether you succeed or not, you should try your best.
在以上的例子中,whether连接词引导了疑问句和选择句中的表语从句,使其与主句进行连接。
as if/though
as if/though是表语从句的连接词,用来表示某种假象或者比喻。例如:
- She talks as if she knows everything.
- He looked as though he had seen a ghost.
在以上的例子中,as if/though连接词引导了表示假象或者比喻的表语从句,使其与主句进行连接。
总之,表语从句的连接词在英语中有三种,分别为that、whether和as if/though。需要根据表语从句所在的句子类型和表达意义来选择适当的连接词进行使用。