Do you Know ____she will come back tomorrow?填连接词——sorry,i don‘t know.when she comes back i will tell you

Do you Know ____she will come back tomorrow?填连接词——sorry,i don‘t know.when she comes back i will tell you
Do you Know ____she will come back tomorrow?填连接词
——sorry,i don‘t know.when she comes back i will tell you

Do you Know ____she will come back tomorrow?填连接词——sorry,i don‘t know.when she comes back i will tell you
if
是否
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weather

if , 宾语从句，你知道是否她明天要回来吗？