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连词（引导词）
当宾语从句是陈述句时（包括肯定句和否定句），连词由that引导，因为that在从句中不作任何成分，也没有任何具体意思，因此在口语或非正式文体中常省略
Yes, I have. I think that I’ve hurt my back.
I think 后面接宾语从句（ that可省略）
I’ve hurt my back. 做think的宾语。
腰 waist 脚踝 ankle
我想她己经上床睡觉了。（现在完成时）
I think that she has already gone to bed.
他认为他是正确的。
He thinks that he is right.
I think that the doctor had better see you.
had better do sth. 最好…
你最好给你的妈妈打个电话。
You’d better call your mother now.
我们现在最好回到车站去。(L95)
We had better go back to the station now.
The doctor says (that) he will come at once.
在英语中，如果把某人所说的话告诉另一个人，要用间接引语。间接引语不用引号，往往在引语前面加that 等引导词。
