will he come back on Sunday?I don't know.（合并为一句）
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willhecomebackonSunday?Idon''tknow.（合并为一句）willhecomebackonSunday?Idon''tknow.（合并为一句）willhecomebackonSu
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！