1、He says that he is a doctor.
2、Can you tell me if he is a doctor?
3、I'm not sure if I can cook it well.
4、I don't know if it will rain tomorrow.
5、I want to know whether it is polite to smoke here or not.
1、He says that he is a doctor.
2、Can you tell me if he is a doctor?
3、I'm not sure if I can cook it well.
4、I don't know if it will rain tomorrow.
5、I want to know whether it is polite to smoke here or not.
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