will he come back on Sunday?I don't know.(合并为一句)

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will he come back on Sunday?I don't know.(合并为一句)
will he come back on Sunday?I don't know.(合并为一句)

will he come back on Sunday?I don't know.(合并为一句)
I don't know if he will come back on Sunday.

I don't know if / whether he will come back on Sunday .
加油!不明白再问!如果帮到你,请采纳,谢谢!