把下列各句合并成含有并含有宾语从句的复合句

1 Do you know if/whether Li Mei studies in England ?

2 Can you tell me if/wheter Zhang Lin is good at swimming ?

3 We don't know whether the answer is right or not ?

4 I don't know if /whether he can play the guitar.

5 Could you tell me if /whether the children had a good time on beach ?

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