1.The method of the next step hasn't been found out yet;
2.He hasn't decided that when he is going to start off;
3.The departure time hasn't been decided yet.
楼主的问题大概和时态还有主被动语态有关
1>. We are not sure what's next step should do
2>.He didn't decide when to go
3>.When to start is not decided yet
1. Not sure what to do next
2. He hasn't decided when to leave
3. Haven't decided when to leave
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