I don't know the exact time when the sports meeting will tak

I don't know when he will have the meeting 同义句 I don't know when will they hold the meeting?I don't know.Maybe sometime I don't know when it is the right time___ the meeting. Will you telephone the railway to find the exact time when t I don't know ( ) A.when the train will reach B.when the trai I don't know the professor * at the meeting tomorrow I am sorry I don’t know the exact answer ____________(I) i don't know when the manager I don't know the ___ number of the students ____(exact) I don't know when we will leave the city.(同义句） I don't know（ ----When _____ the meeting _____?------I don't konw yet. I don't suppose he will attend the meeting,_______?